what a lot of wierd answers
if your 11 yo GD told you she was going to marry (some pop idol) when she grew up would you say 'lovely dear, but it may just be a phase - you may actually be a lesbian'??
Many people say they 'knew' they were gay from this kind of age or younger, the only reason people don't 'know' they are heterosexual at that age is because it's the default position, so nothing in the expectations of those around them jars. Given the amount of homophobia around I think it highly unlikely a boy would say he was gay without a good reason.
Give the boy some credit!