I suck at everything

I used to be an intelligent kid and whatever but i don't know what happened to me, my grades were so bad last tests week and i was trying my best to get good grades on this one but i just suck at it, i keep getting them wrong and i don't know what to do with it, i barely have motivation to take a book and review everything I've been 'learning', specially because I'm not interested on biology, or physics or math, and it's not just that I'm not interested in them but they make me feel so so stupid when my friends get it and i don't so I was just thinking about how would life be if i was doing something i actually liked and I'm good at, but I'm not good at anything i suck at everything I like and dislike and i hate myself so much for that