Lack of motivation

I'm facing my last year of high school- and I can't find the motivation or inspiration or whatever the appropirate word to go and do what is neccessary. I completely screwed up last year- and now its my last year and I have to get my g.p.a to a place needed to get into a somewhat decent college. It's so stressfull, and it's my fault, I accept that, and it would be stupid to drop out before my last year begins. But I'm so scared. I don't know what to do. I want to talk to my family, but I don't know what to say, if I mention my doubts they will assume I don't care or I'm lazy when I'm only afraid that I won't succeed. I'm scared of failing. I don't want to fail myself or my parents or my family. But I think I am. My friends give me the kind of advice that you could have given to yourself. "Just go in there and prove yourself and everyone wrong" Well things are much easier said than done. Feeling incomplete. and inadequate. and a failure. is nothing less than feeling like you are worth nothing. any advice? any different advice?

Forget last year and start again. this is the time where you become what you can be (not will be). If you stay patient, focussed and determined you'll be fine.