Shocking though it might seem, her experience is by no means unique. According to World Health Organisation figures, 14.2 million girls under the age of 15 are forced into marriage each year.
The end of childhood: A child bride is pictured in Tanzania. Alemtsayhe Gebrekidan has told of how she suffered a similar fate when she married age 10
Problem: Early marriage, such as this one taking place in Malawi, are the fate 14.2 million girls every year
New life: Alemtsahye Gebrekidan was married off at the age of 10 but now lives in London
Most come from India, the Middle East, and like Alemtsahye herself, from sub-Saharan Africa - Niger, Chad, the Central African Republic and Ethiopia among them.
The consequences are appalling. Along with an education and childhood cut short, girls suffer a traumatic initiation into sexual relationships, are put at risk of domestic violence and STI's, and have the chance of a career or better life taken away.
Worse, many also die in childbirth or from pregnancy-related complications - the leading cause of death for girls aged between 15 and 19 years old in developing countries, according to UN figures.
'Child marriage is an appalling violation of human rights and robs girls of their education, health and long-term prospects,' comments Babatunde Osotimehin, executive director of UNFPA.
'A girl who is married as a child is one whose potential will not be fulfilled.'
It's a view with which Alemtsahye agrees. Now 38 and living in London, she says she still feels angry with her parents at times and says her life was 'ruined' by her early marriage.
'My parents and his parents decided [on the marriage],' she adds. 'I didn't choose.'
Before the subject of marriage was raised, Alemtsahye remembers a happy childhood in Ethiopia's northern Tigris province.
Work: After her marriage, Alemtsahye left school and spent her time on chores such fetching water instead
CHILD MARRIAGE: THE FACTS
- One third of the world’s girls are married before the age of 18
- One in nine are married before the age of 15.
- If present trends continue, 142 million girls will be married before their 18th birthday over the next decade. That’s an average of 14.2 million girls each year
- Girls living in poor households are almost twice as likely to marry before 18 than girls in higher income households.
- Girls younger than 15 are five times more likely to die in childbirth than women in their 20s.
- Pregnancy is the leading cause of death worldwide for girls ages 15 to 19.
- Child brides face a higher risk of contracting HIV because they often marry an older man with more sexual experience.
- Girls aged between 15 and19 are two to six times more likely to contract HIV than boys of the same age in sub-Saharan Africa.
'I was in school,' she remembers, 'although I stopped the school when I was married. I do have happy memories of childhood - it was just eat and play.'
All that ended when it was decided she would marry a boy, who until the day of their wedding, she had never met.
'I didn't know him,' she says. 'I was OK when I saw him - he was a child like me. He was upset as well, the same like me... he was 16 years old.'
As Alemtsahye's story reveals, girls aren't the only victims of forced marriages, although as Jacqui Hunt, London Director of campaigning charity Equality Now makes clear, their experience is often far more traumatic.
'Boys do get married young and that is an issue that needs to be addressed,' she explains. 'But the majority of child marriages involve girls.
'Also, boys tend to marry girls same age or younger while girls marry much older men. Boys also aren't taken out of education while girls run the risk of early childbirth and all the complications that brings.'
While Alemtsahye was, at least, given a husband closer to her own age, the wedding meant leaving home, leaving school and beginning life as a traditional Ethiopian wife.
'I was collecting water, wood and cooking for my husband and the days were like that,' she remembers.
'The water was far away and not near to our house. We would go far, then come back and I would cook for my husband.'
By the time she was 13, Alemtsahye, although still a child herself, had a baby son, Tefsalen, now 25, to care for as well.
She remembers the pregnancy and birth as a traumatic time, made worse by the fact that her immature body couldn't cope with the physical demands of carrying a baby.
'When I was pregnant, it was painful and I cried,' she recalls. 'And also when the baby was delivered it was so painful because I was a child.'
But if pregnancy was difficult, motherhood was even tougher and made worse by the fact that in 1989, Ethiopia was in the throes of a vicious civil war.
The conflict, which raged intermittently from 1974 until 1991, eventually left more than 1.4 million dead, among them, Alemtsahye's young husband who was just 19 when he was killed fighting with rebel forces to overthrow Ethiopia's barbarous Marxist dictator, Mengistu Haile Mariam.
The 20 countries where child weddings are most common and the percentage of girls involved
Difficult: Like this child bride, photographed in Uganda's Katakwi district, Alemtsahye had her son at 13
CHILD BRIDE HOTSPOTS: COUNTRIES WITH WORST RECORD OF FORCING EARLY MARRIAGE
1. Niger
2. Chad
3. Central African Republic
4. Bangladesh
5. Guinea
6. Mozambique
7. Mali
8. Burkina Faso
9. South Sudan
10. Malawi
11. Madagascar
12. Eritrea
13. India
14. Somalia
15. Sierra Leone
16. Zambia
17. Dominican Republic
18. Ethiopia
19. Nepal
20. Nicaragua
Source: UNICEF
2. Chad
3. Central African Republic
4. Bangladesh
5. Guinea
6. Mozambique
7. Mali
8. Burkina Faso
9. South Sudan
10. Malawi
11. Madagascar
12. Eritrea
13. India
14. Somalia
15. Sierra Leone
16. Zambia
17. Dominican Republic
18. Ethiopia
19. Nepal
20. Nicaragua
Source: UNICEF
'I was a widow at 13 and when [my husband] left me, he left me with a one-year-old baby. It was very hard. Very difficult for me left behind with a baby and still a baby myself.'
And although she hadn't wanted to marry her husband, Alemtsahye says she still feels sad when she thinks of his short life and how little enjoyment he had.
'I feel sorry for him because he did not enjoy his life,' she says. 'He married young and finished in a war that ended his life. When I see his son, I sometimes cry.'
Left alone with only her son, Alemtsahye was left vulnerable and soon fell into the hands of traffickers, tempted by promises of a better life abroad.
Leaving her son with her mother, she travelled to Egypt where she worked as an unpaid domestic servant.
But just two months after arriving, more traffickers appeared - this time promising her a new life in the UK.
'I was smuggled to London by Arab people,' she explains. 'They said: "you are working with us and we will take you to London". They brought me and then they left me here.'
Still just 16-years-old, the former child bride was now an asylum seeker, initially placed with a foster family because of her youth but swiftly moved to a tiny flat of her own.
She went back to school and learned English and now helps to run a charity called Girls Not Brides which aims to help former child brides from Ethiopia.
Her son, now 25, lives in the Ethiopian capital, Addis Ababa, and grew up with his grandparents, only seeing his mother during her occasional visits home.
'It was so hard, very difficult,' she says frankly. 'I was thinking how to bring him to live with me [in London] but I can't bring him now because he's in his 20s. I tried last year and they said no.'
Did she ever worry that her parents might try to marry him off at a young age as well? If they had, says Alemtsahye, she would have found a way to stop the wedding.
Children: Alemtsahye says parents should allow their daughters to have a childhood and be educated
Global problem: India is the country with the highest number of child brides, this little girl among them
'I told him: "Never ever think to marry young! I wanted him to get educated so I said to him: "look at me, I am your mother, look at everything that messed up my life!"'
'He is a carpenter,' she adds. 'I am very proud of him now!'
Although Alemtsahye's story has a happy ending, she's aware that the problem of child marriage shows no signs of going away and, if WHO estimates prove correct, could become increasingly widespread over the next five years.
'I would say to girls, don't marry. Enjoy your childhood and go to school - learn. For me, I feel my childhood was robbed. I missed my education - I ended up empty - with nothing! I learned everything in London.'
And for the parents of those girls, her message is stronger still. 'Why do you damage his or her life?' she asks.
'Send them to school to study. Do you know the problems that come with marrying off a child so young? They will miss their childhood.'
For more information on child brides and Alemtsahye's efforts to help them, see girlsnotbrides.org
