Replying to College/University.

okay so it's course selection time for grade 12.. my last year before i go to college/university.. my problem is that i still dont really know what i want to do! And i was wondering what you guys were studying for some ideas.. Partially because i still dont know what i want to do and if i do want to do something i would have to choose the specific prerequisit courses for it.. But ya anything would help.. i need some ideas. thanks guys