FTM tips/help?? high school?

So I am now going into my sophomore year And has started trying to transition last year, I started about half way through the year. Im 15 now so I believe i am to old to take hormone blockers(or can I? not sure) But i was wondering about advise for FTM's in high school and what else I can do because I already dress and change my name and people know.what else can I do?