How do I make myself study and do well in school It's longish but please help :(?

[Haters make me famous~!]

Okay so for my whole school life so far I've been a perfect, straight A student and I always do my homework, always studied for tests etc. This year though, I am totally sucking in school for some reason (I'm a junior in high school) and I know I picked the worst possible year to start slacking off but I really can't help myself. I want to get into a good college but I don't really know why. I just feel like I should get into one and because my parents want me to. But I have been thinking a lot recently and I just have no motivation to do well because I dont even know what I want to do or why I want to go to college. I feel really directionless and my grades have been suffering this year, which sucks because its my junior year and an important grade year. I knwo its my fault but somehow I still feel helpless to myself. I never study anymore, i put off homework until late at night or sometimes never even do it. I really CANT pick myself up and just start doing the work. So I really dont want someone to answer me saying "start studying! youll regret this!" or "i know you dont want to but do your homework!" because all of that means NOTHING to me.... I really CANT do my work because I feel so hopeless and depressed about school.

help me please? I need advice or anything. I want to do well but I dont enjoy my life even when I dont do my homework, it seems like life would be an ultimate hell if i spent the time i spend doing nothing studying. I really feel stuck. Please help me.