Hi you,
To continue what Maebh said this doesn't look like it's going to go away. Many of us passed this road before. Denial can get things worst so don't push it away because it's going to come back anyway.
First you must know who you are when you dress. Do you feel like a women, a men in a dress, a men covering is identity or... etc.
Search this forum for answer, consult Wiki and ask us the questions you think can help you.
When I was your age I was hiding like you do

I waited till it was really late to dress when everyone was asleep. I even stole lingerie from my friends sisters and hide it under my bed. (Don't do that

)
Just find your way, you will get it through we always do.
Good luck
Sérénité