What to do if you have a compressed spine?

For many years, I have sat in front of the computer with my back slunched over. And now, I have gotten in the habit of popping my spine whenever I walk xD. My spine does not hurt, but whenever I walk, it feels akward and wobly (it's a weird feeling) and I think the plates in my back might have grown in akward positions because I have very long adult sized legs at 17, and a very short upper body that looks out of place. I am 17 and I am 5"6 1/2, but the doctors said when I was 12 that I was destined for 5"9 to 5"10 and possibly even 6 foot. I know that is not possible now because I think my body has fully matured. Is there some place I can go where they can somehow stretch me or something so I can get my full height?