Be glad ya got what ya have and not sitting in a wheel chair.
Well that was just depressing...
Hi,
Sounds like you are an ectomorphic body type. Nothing to be ashamed of, but a frustrating situation(I know). I would recomend looking up ectomorphic on the web and cross referencing it with men's studies. There are several ways a skinny guy can bulk up.
Protien intake and a good diet is crucial. Additionally, shock weight lifting is an excellent strategy. If you work out to often your small muscles may be damaged if not given enough time in between. You should consume protien right before or during your workout. This will allow the body to start replacing damaged muscle tissue right away. This will also work well if you have a fast metabolism.
P.S. I do work at a health club in CA.