If I'm with one friend, I'm fine. However the second another friend or other person comes into the equation I always feel left out.
I often feel as though my two friends, even if they don't know each other, are being a bit mickey taking about me and a bit 'yeah yeah, we'll humour you'.
It's just happened at school collection today. I was chatting away happily with friend A. Friend B came over. Friend A and B don't know each other but they immediately started to chat and left me out. I said something and Friend A burst out laughing as if I'd said something very stupid.
I always end up being left out in a group of 3. I went shopping with a friend recently and she brought another friend along without telling me, and they spent the day totally leaving me out.