You are in HS right now? If so then i would go to college get a degree in some science and figure it out then... one if you want to do cars you can get an engineering degree, two if you decide to become a dr your on the right path anyway, third don't know if you have checked into med school, but that is alot of school... yes the money is good, but $$$ ain't shit if your not happy. you have tons of time to figure it out, get some college under your belt 1st.