How to know what i wanna do??

I'm a high school senior now and we are getting bombarded with college Ads. and what not, so i dont know what to do as a career now, since i was little i used to tinker with electronics, a while ago PCs, and now 3D animation......so i just tought of being a PC engineer, but now i think i wouldnt be able to make enough money for my "dream" stuff, so i considered surgeon...takes 10yrs, possibly more but its a respected and well job....i think i can take all those yr of college...but im still thinking, should i just let time decide?