I have a problem. Someone please help and respond!

I have a problem. It occurred to me at the beginning of the year that I would really like to join the Air Force. To be able to wear that uniform and fight for a greater cause has always kind of appealed to me but I never really gave it that much consideration until I got my ASVAB scores back. It was then that I truly realized that I just might be able to do it. Every since then though is where the problem comes in. I want to be in the Air Force so bad that my chest aches when I think about it, which is all the time, but I have times where I doubt that I could truly do it. I have some kind of joint problem where if I ever hurt something, the ligaments don't heal like they are supposed to. I have to do therapy to make them heal. But at the same time I know that if I were careful and didn't get hurt that I could get past the physical part. Plus the Air Force is more about intelligence too. I also know that I have low self esteem and that gets in the way sometimes and I keep trying to convince myself to just give up and go to college when I know that that is not what I want when I could be in the Air Force and go to college too. I also have the health problems but I feel they are a bit too personal to put on here. I just want to know thy someone thinks I can do it. I want someone to believe in me. I know that I am strong enough that I can withstand all the screaming and mind games because I put up with them almost everyday with my extended family anyways. What can make me sure that this is what my destiny is? Is it the ache that I have when I think about it or the fact that I can see myself in that uniform as a physical therapist in my minds eye? I need help! I'm screaming out for help!! I can't make up my mind.