Why do I feel like an idiot when I do the elliptical?

I’m a runner. I ran in a marathon in 2006, and I run just here and then all the time. About 2 years ago, I hurt my shoulder. Now, when I run… it hurts like hell. It just gets really tense… and no one knows what is wrong with it. I have had MRIs, gone to many doctors and they all have said that it is in my head.

So, recently, I started doing the elliptical machine, and I don’t believe I am doing it right. I sweat a lot, so I know I am doing something right…. but I don’t feel like I am actually doing anything. Plus. I feel like my feet are not where they are supposed to be. Is this just because there is some newness to it? Or am I doing it wrong and I am a complete idiot?