It's difficult to know if someone this young will become a doctor. It's a long, long road to become a physician- 4 years college (ideally a science major with top notch grades), 4 years medical school (which can be grueling), then more training. I did 8 years of training post-medical school, working over 80 hours a week, paid $35,000 a year.
Where I went, at Harvard Med, very few of the students had actually decided to become a physician at an early age. It's too early really to say.
Some subjects are interesting to study but don't lend themselves well to a career, and vice versa.
