I would, directly out of HS, go to flight school and get up to the CFI. Then, go to college and get ANY 4 year degree. On graduation, you could walk into an airline at age 22 or 23. I screwed up and did college first, so I was a starving CFI at 25 with a 4 year degree and no job prospects. Go to a VOCATIONAL school for flight training (I went through at FSI up to Comm/Multi/Instr then Paris Air and got the CFI, CFII and MEI in 5 weeks.) Nothing to MEI...11 months. So, if you choose to do that before college, immerse yourself and don't get caught up with partying and chicks till your done. Remember, you'll have 4 years in college to do that.
PM me if you want, I love giving advice.

(The above poster accepts no responsibilty for the advice dispensed and all advice is intended to be followed cautiously and at your own risk. )