Young lesbian, gay and bisexual people start becoming depressed and self-harming from the age of 10 because they feel different from their heterosexual peers, research has found. LGB 16- to 21-year-olds are four times more likely to have felt depressed, harmed themselves and thought about killing themselves, according to a study based on interviews with 4,800 young people from in and around Bristol. Experts said the numbers were linked to the bullying, stigma and abuse that some young people experience as a result of their sexuality.