I just got out of a relationship with someone exactly like that. It was a horrible experience which broke my heart, as he ended up leaving me because he would rather sit in his room alone than go out somewhere with me. I'd say steer clear if you can. Even becoming friends with someone like this will put a massive amount of stress on you, and it's obviously already effecting you. If he asks you for help to break his awkwardness, then try to do so. If not, leave him be.