Sup Vic?
I get that feeling sometimes too, right when I got clean and got into NA and didn't know anyone, I would sit in a meeting feeling all uneasy and out of place, but the 3rd tradition would stand out in my mind. The only requirement for membership is a desire to stop using. I had that desire so I figured I was in the right palce. When I get up in my head about what I percive people thinking about me (see that even sounds rediculous, how can I percive someone else's thought process?) I go over the serenity pray in my head to remind me that I can't change someone else and all I can do is be myself. Not sure if any of this made any sense to you, but it's what helps me when my disease puts me at dis-ease with myself. You earned that seat so go fill it!
Later,
-Blake