Active Duty? WHY?
Dude,
Find an ANG or Reserve unit. Active Duty sucks, the guard and reserve don't. You will need to earn a Bachelor's degree, make pretty good grades, get hired by the reserve or guard, score well on the AFOQT (Air Force Officer Qualification Test), pass the medical exam (like the previous dudes wrote, contact an AF flight surgeon for a thorough color exam, the reserve and guard have plenty of flight docs that would be glad to speak with you), and off you go to OTS (Officer Training School) for 12 weeks and out you pop a second lieutenant. If you go guard, 6 weeks of the guard "academy" and out you pop a 2d Lt.
Then you go to SUPT for 54 weeks then off to follow-on training (anywhere from 6 to 9 months), then back to your guard or reserve unit full-time for 2 to 3 years, or more, if you wish. Then you can become a part-timer if you so desire and you have just bypassed all of the active duty misery.
Good Luck!