OP, I admire your enthusiasm and that you have goals. Just be realistic and open minded along the way. I was well on my way on the "fast track" back in the day. I had all my ratings within 2.5 years at UND, became an instructor there and was working on my MEI when I had a change of heart. Accomplishing this at UND is/was a pretty big deal and was a sure fire way to get drastically ahead given the number of flight hours you could accumulate, but luck played out and they were desperate for instructors and pretty much hired everyone that applied, but I looked at everything I had accomplished and realized I hadn't had as much fun as I should have up to that point. I didn't even have a steady girl friend or even randoms for those 3 years after HS graduation. It was all work work work, go go go. IOW, I got burned out.
I did aerial survey and now fly freight in single and multi-engine pistons. 5 years of flying for a living and I'm still flying small pistons, but the pay has been fantastic along the way and am currently living relatively where I want all while being home every night. A bit of the adventure side is still there and I will be continuing to scratch that itch for a couple more years as I look for another job at the moment. Am I happy? Well I gotta say I'm jealous of schedules my airline buddies have and would probably enjoy strutting around the airport in the monkey suit hitting on the ladies. I'm a tad egotistical like that.

Overall, I'd say I'm on the happy side. Back when I started school, if someone told me this is where I'd be, I would have told them they're CRAZY!
I do look back to those months when my motivations changed and wonder, if I had just stuck it out through MEI and then an additional year of instructing, where I'd be now. Pretty solid chance I'd be starting my 3rd year at Air Whisky. Things were still slow back then though and if I knew then what I know now, I'd probably lean more towards the cookie cutter route. It's tough to say if I'd be happier doing that. Like others have said, there's many things you can't control that will affect your path. Your motivations and priorities change.
Jokingly, I'll say this. When you get to college, the ONLY thing that should be on your mind is how you're going to plow as many girls as possible! Class and flying take the back seat! On the serious side, live a balanced life. Don't worry about the grades so much because it doesn't matter, if it does when you interview for a job, then that place is not worth working for. Now, if you can hang with your friends AND get straight A's, you are blessed, if not, don't sweat it. Try to keep it in the grades in the B range though...