I think eveyone goes through a stage some point in highscool that is just like yours. I did. It can be very confusing, depressing, and frustrating, its something that we learn from and kinda like a right of passage. Once you get through this funk things will seem alot better. You just have to get motivated to better your self and your grades. You will graduate highschool and go on and have a wonderful life with a family and good job, you just have to want it enough.

Life is a gift and there are too many people who have theirs cut short. So live life every day with no regrets and to the best of your ability. Killing yourself wont make anything better, if anything it will make it worse for the loved ones that you left behind. When you wake up in the moring just look at yourself in the mirror and (I know this sounds stupid but its works.) and tell yourself that you decide how your life is going to be and wont settle for anything less.