In desperate need of advice!?

I am a fifteen year old male in high school. One year ago, I came to the realization that i was in fact homosexual. However, this is not easy, as I live with very staunch conservative parents who have minds closed tighter than than a Tibetan Monk's mouth. I have been so depressed lately; my grades have plummeted, and i have engaged heavy partying to cope with the depression. i need some advice badly!!!!!!