Oh, boy, asking about flying on a Mac forum
I just got my Private Pilot's License and I'm in the ROTC and here is what I can tell you:
Definitely get into the Air Force ROTC. Pick a college that has one, and start first semester. Not only do you have a decent chance of getting your college education paid for if you keep your grades up, but it is actually pretty fun. Good grades + good physical fitness + good leadership will get you a commission, and a chance to get a Rated (pilot) slot. The time commitment when you graduate ranges; nothing if you aren't on scholarship, and if you do get selected for flight training there is a ~10 year commitment.
Personally I love flying so much that I couldn't wait to graduate and possibly get a flight slot, so I went for my Private Pilot's License (and will probably keep going for Instrument, Commercial, etc.) I expected to finish it in a couple of months and it ended up taking a year. Nobody does it in the minimum number of hours. The flight school quoted me about $6000 for the whole thing, but I expected it to be more like $8000. In total it ended up costing me $10,000 so be prepared for that. If you want to be an airline pilot without going through the military then basically the only way is to pay $60,000+ for flight training, so most new pilots have tons of student loans.
Good luck, research, and don't give up!