Chris here's the real skinny.  I'd recommend AFROTC in college.  While in HS...take classes you ENJOY the most.  Participate in sports you ENJOY the most.  You want your grades to be high enough to get into a college that has AFROTC.  Then, while there, major in a degree that you ENJOY!  I can't stress that ...

I'd go ROTC in college.  Easiest path in my opinion.  If you want to see continually updated statistics on guys that got pilot slots through ROTC or OTS you can check out www.wantscheck.com - it'll give you an idea of the GPA and AFOQT test scores (and flight experience) required to get selected for pilot training.  Hope it helps.- ...