You still have a long way to go, so leave yourself open to change. Also, do your best ins chool because that will help you become a officer, or your can use the scholarships to jump straight into college.
That being said, I've trained with marines for a while and was with them for 6 months thinking about joining, but then met a girl and the marines were sad to see me go. DO NOT SIGN anything, NOTHING, and don't let them pressure you into it. The recruiter i hung with was very nice and didn't put to much pressure on me at all, but i was with the marines, the army center and national guard around us were kind of.... well not gonna say anything because i might just be prejudice because marines are judgmental sometimes ;)
Anywhos, just train and workout, you have a long time till you can seriously look into signing up or being recruited. You have to be 17 to sign up early then they ship you off when your 18, but you have a long time so just stay in shape, and do outdoor things. I did a lot of running, hiking, and considerably dangerous jumping around lol.

I hope this helps answer your question, good luck in the future! No bootcamp till your 18 but you can always train hard till then. I heard airforce bootcamp isn't very tough though.

You can sign up to go into the Air Force when you turn 17 but you still have to graduate high school. I went to college for a year, then went to the Air Force. I hated it there, but it was something to do until I got medically discharged. Bootcamp was easy, though I can't give too many details about it. Just be prepared to be yelled at constantly and even though what you do may be right, it never is, so be prepared for that. For now, just really start to workout by running and doing push-ups and sit-ups, learn to never talk back and do what you're told without question and by the time you're ready to ship off, you should be just fine. In all honesty though, no matter what you do to train at home, it will never prepare you to what bootcamp is actually like; there is no true way to prepare.

The other respondents are right; you have a long ways to go so don't become too preoccupied with this. If you don't have glaring medical or legal problems, you'll be able to enlist and succeed. If the airforce remains your goal until you're 18 (generally enlistees to the airforce must be 18. the army allows some 17-year olds to go to boot camp and sign the enlistment contract, but it's rarer in the other services) then here's a few things to consider:

1.) avoid legal problems. your recruiter can help get waivers for some charges (misdemeanor, felony, DUI, it all depends) but it complicates the process. If you lie about your criminal record to the military they WILL FIND OUT while you're in basic training. They run nationwide background checks on everyone. You will be sent home.

2.) Avoid drugs for at least a month before you go to your recruiter. He'll be bringing you to a MEPS station where you'll be tested. If you think you might fail, tell your recruiter. He wants you to pass and bump up his recruitment numbers. he really doesn't care if you smoked weed or whatever. You're 13, so hopefully you haven't tried illegal drugs. I'm not some moralistic idiot who will tell you that 'drugs are baad mmkay,' but you can't do them in the military. they test often enough to catch plenty of regular users (all but the very crafty and the very lucky, i think). a love of weed or other controlled substances doesn't go real well with the military lifestyle. This aint vietnam and they will kick you out (for weed they'll probably just demote you. either way it's years of work gone instantly)

3.) work hard in school. when you go to a recruiter, he'll have you take the 'ASVAB' (armed services vocational aptitude battery). It's mostly a big SAT, but there are a few sections toward the back dealing with flight gauges, motors, electrical circuits, etc. You don't have to study; it's measuring general aptitude and just bc you can't read their gauges (i couldn't and i got a 96 out of 99. it's just general education and intelligence theyre testing) doesn't mean you're fucked.

Your asvab scores will dictate what jobs you can do in your branch. Don't stress about it, there will be plenty of other factors determining which job you can get.

4.) DECIDE WHAT YOU WANT AND GO FOR IT. the recruiter has a tough job. He's a E-6 or E-7 (usually) who has to fill slots for different jobs every recruiting period. His career depends on him making the numbers. He (or she... prob. he) will lie to you, fail to tell you things, etc. if he is late to meetings, isn't moving the process along fast enough, telling you half-truths or telling you he can't get you the job you want when you're qualified for it GO TO ANOTHER RECRUITER. Do your own research and do it well; do not rely on them for answers. they will try to push you into a job thats hard to fill (an unpopular one, in other words). Recruiters are not your friend! once you've shipped off to basic, they hold no responsibility and they will ignore anyy questions or complaints.

5.) READ YOUR ENLISTMENT CONTRACT CAREFULLY. you're not buying a cell phone here. this will set the tone of the next 4-6 (at least) years of your life.

6.) The airforce has the best quarters, the best gyms, the shortest deployments overseas, the best job prospects coming out, the smartest (on average) recruits, etc. It also has the easiest basic training (maybe tied with the Navy) because of the jobs airmen do, theres less physical challenge, less hunger, less anger than other basic training courses. The marines have the toughest, followed by the army infantry (my own job for 6 years... we all do our basic and AIT at ft. benning, GA) followed by non-infantry army basic courses, followed by the airforce and navy. If you're in decent shape (not fat, stayed active, spent plenty of quality time outdoors) you'll smoke the competition. You will have to take several PT tests consisting of (they might change it soon, but the following events have been in place for decades): max pushups without going to knees in 2 minutes, max situps without resting on your back for 2 minutes, timed 2-mile run. Work on these events, get strong and always maintain your aerobic endurance (i.e., run alot) and you'll be a PT stud. It's an easy way to win alot of points from your commander and the respect of your fellow airmen.

7.) They don't call airforce basic 'boot camp' so much. It's just basic training.

Good luck kid. The airforce flies combat missions daily, moves men and equipment from base to base and is always the opening salvo when we decide to use military violence against another government or some unlucky pack of cave-dwelling terrorists. It's an important part of America's military supremacy and we need good airmen. I wish you the best.