Hello
I can see that something might be overwhelming you when you're in a group. Maybe you worried that others might do something or say something? It could help to have a closer look at your thought as they might explain why you don't feel comfortable. It seems that being in a group is triggering something that you might be sensitive about. Maybe trying to understand your thoughts and align them with reality might help.
I hope that it helped little bit, please feel free to share your thoughts as it might help to clear things up
