If you're out to your family, definitely see about getting on hormone blockers. And when you're 16-18 is when most doctors will consider giving you T.
As for dealing with the guys growing and you not, I'm afraid I can't help :/ I went to an all girl's high school so I didn't have to deal with guys around me all the time. But I know it's hard, I had a friend who I saw a lot who made me dysphoric because he was tall and growing a beard.