Do your best without killing yourself, cuz to be honest, its not gonna get easier. College is A LOT of work. My philosophy is, why give 100% when you can get by with 50? If youre parents are disappointed with you, so freekin what. If you get into a decent college and youre happy thats all that matters. The work always gets done. Trust me. Im the biggest procrastinator ever, and it always gets done in one way or another. Just relax, pick up your axe, and play.
The only real advice I can give you is relax and dont kill yourself. Its high school and its not the big deal people make of it. Theres always time for redemption.
Dont shoot yourself in the head.