I'll second what FLY2LIM just said. Getting into the academy is nearly impossible based on the number who apply. I have a couple friends who were straight A students, all conference athletes and members of the National Honor Society. They had letters from a number of local congressmen and a senator and still didn't get in.
Another route to go would be ROTC. Many aviation schools have an AirForce ROTC program. Basically, you sign up but go to school for your 4 year degree first. While there you will take some special courses taught by the AirForce and also have some other requirements. When you graduate, you have a commitment to the Airforce of a certain number of years. You also recieve a stipend and some tuition payment from the military, but I'm not sure how much. Doing this accomplishes two things. 1) You're an officer. You need to be one for flight training. Officers also get paid better. 2) You get a four year degree which will help you after your military career.
I thought hard about going into the Air National Guard. Thought it was the greatest idea while talking to the recruiter. I mean no offense to them, but they are basically salespeople. Their job is to sell you on the airforce. Turns out my neighbor was a high ranking officer in the wing I wanted to join so he gave me the "real" tour and introduced me to some guys my age. I started asking them lots of questions and got much more insightful answers.
After much soul searching(I'm talking MONTHS of it), I decided that it wasn't for me. It takes a certain type of person. This is a huge commitment much like any college would be and should be made with the most information that you can possibly get. Whatever you do, don't just go in because playing with the planes looks cool. You'll quickly realize that you made a mistake that you are now bound to for a few years. Find some people that are or were in, talk to them and find out what they think. Find some peers that are considering the same thing and pool resources. Talk to your councelor. Talk to some universities that have ROTC programs. Knowledge is power. The more you have, the happier you will be with your decision whatever it may be.
Whatever your course may be, good luck!! Keep the blue side up, and the brown side down