Me, personally, I never really knew, but now I know that I want to become a doctor, something like a neurosurgeon, as I'm fascinated by the human brain and body. The high school I'm going to attend even has a medical program that, if you get in, allows you to pretty much be an intern in your senior year. It's an undergraduate program that allows you to spend time at the hospital and do research in your sophomore and junior years. I'm going to ask for more details, since I'm in a summer program for my high school.
Anyway, what about you guys?