It's always good to set high goals and to work your butt off to acheive them, but prepare for the reality that getting to the tour requires immense talent, mental fortitude and more than a bit of luck. Keep at it and you might get there but understand that somethings are just impossible to control.
Take it one step at a time...find a pro you trust, devote all of your time to good practice, get yourself to right around scratch over the next year or so, and get yourself used to playing in serious tournament situations. Show well enough and you might attract the attention of some colleges. If a scholarship doesn't materialize, make sure your grades are good enough to get you admission somewhere. You can always trust your game and try out for the golf team as a walk on. Once you've got the college hurdle down, then you can start thinking about a career in golf, whatever that might be.
I'd never say never but I tend to agree with JoePro on this one...even the non-touring pros that I know were at scratch before they started high school so you're already at a slight disadvantage to the competition. That said, this doesn't mean that golf won't play a big role in your future no matter what happens.