Im bored and i can't do anything for the summer!?

my whole summer is just on the computer either on face book playing farmvill watching mmd on youtube or watching anime! my mom says i need to do some classes like karate or dancing u know physical stuff she says im gonna be fat hermit watching anime all the time! but i dont like that i dont like fighting or dancing or gymnastics i like anime and drawing.and i really want to know when i grow up what should i do? i don't want to write manga or be an artist like everyone thinks im gonna be. i want to be something else i seriously dont know what to do with my life and i need help! i must decide this before i get in highschool even at school they erge me to decide my career i feel trapped what do i do?!??!?!