I reccommend getting out there and actually trying stuff. I had no idea I loved taking care of sick people so much until I actually had to do it for a while. Then I realized I was meant to be in the medical field (I'm in school to become a nurse). You don't have to feel pressured to pick something right away. You still got some time. Experiment. See what you like. And remember that even if you pick something you don't have to stick with it if you don't want to. I'll probably change my career at least 3 times...I love change.
Oh and I agree with the poster that mentioned doing stuff with your hands...I definitely reccommend trying that type of stuff out. For some reason I really love having tangible results...I think it's the way us ISFPs are wired.