Hi UCI Gimp, I am sorry about the fact you are young and have these problems to deal with. You've come to a good place where others do understand the frutration.
I was told something similar when I had meningitis and got a septic infection in almost all my joints and spine, as well as a brain infection. I was in a wheelchair, moved to crutches and then a cane, then nothing but my own two legs... all in a few months. The initial diagnosis was 50% chance I would not walk again. Wow, were they wrong. I played sports, jogged 12 miles a week, etc and was diagnosed 17 years ago. I have arthritis in my knees only recently but a pill a day helps and my life is just like anyone elses. What doctors tell you can be scary. Please don't take it to literally. Take precautions but don't go through life waiting for that moment you can't walk. Best of luck.