First off, you MUST become a commissioned officer.

Your best bet for that is to get into a service academy.  Talk to your guidance counselor and do all you can to make yourself competitive to get into a service academy.  But to put it into a nutshell, you need to take a heavy math and science load while in High School AND you must get good grades with that load.  GPA of 3.7 or better to be competitive.  It helps to have plenty of extra curricular activities you can point to to prove you are not just an academic geek, but well rounded.  Sports helps, but is not required.  If you are especially athletic and have good grades, you're a shoo in.  The service academies recruit athletes just like any other college.  Joining the Boy Scouts and earning your Eagle rank can also be a BIG plus.  Then start applying to the USAF Academy (USAFA) while in your junior year at High School.

If you get into the USAFA, you're well on you're way.  If you don't, well, don't forget to also apply for the USNA, and maybe even USMA.  You can cross-commission from ANY service academy into the USAF.  Even if your cross commison attempt fails, if you're a USNA graduate you can become a Navy pilot with wings of gold rather than a zoomie pilot with wings of lead.  Afterall, everyone knows Navy pilots are hotter than USAF pilots

You can also get a USAF commission through an ROTC program.  The chances of getting a commison through ROTC just go down relative to a service academy, and the chances of getting a pilot slot once commissioned also go down.  But ROTC is still a good way to go about getting a pilot slot in the USAF or USNA.

If your grades are not too great, you can join the Army and fly for them.  The Army's pilots are warrant officers, not commissioned officers and no college degree is required to become a warrant.  But in the Army you are probably only going to get a chance to become a rotory wing pilot.  The Army has LOTS of helos and few fixed wing aircraft.  And absolutely no fighters at all.

Good luck with your ambitions.