I feel you! I am awkward by nature and have a little trouble knowing how to interact with people. I often feel like I am in the way rather than being helpful.
Just keep trying. My first FC experience went to hell, but I was taken in by a nice group. Look for smaller groups rather than big ones. IMO big groups often have the trouble of just inviting but having no quality of interaction. Try not to be afraid of stepping up and showing them you are someone that wants to be a part of the group.
Wish you good luck friend~