I don't feel like I have anything wise to say to you either, since I have never done group therapy......and find the whole thought of being exposed in a room full of people a difficult thing to handle! I totally get the door thing, because I always always want an escape route too.....I always want to sit at the end of rows too so I can just breathe freer!
I do want to offer you support and encouragement though! And I think I agree with what Sannah is saying, too.....I think I see something in what she's mentioned that may be true and an important issue for you. I think you are doing so well, really, in being aware of yourself and your issues and needs.....