So you don't really enjoy these groups? Can you chose different kinds of groups then? Maybe this is why it is hard to join in the conversation because you don't really enjoy them?

What I notice about myself when I am in a new group is that you don't get their attention as easily as when you have been around the group for a longer period of time. Is this familiarity????? I don't know, but I do know that if I stick with it, it will improve. What I have also noticed about myself and with others is when you speak so quietly that people don't hear you or you don't attract the attention so another louder person gets the attention instead. This also improves with sticking with it and not giving up. Groups are funny........