Struggling in groups

Struggling in groups Hello so I'm 15M and I've always struggled with talking to a big group since 7th grade. After going to a therapist I'm way better at talking to friends and I'm okay if it's a 1 on 1 convo even with someone I don't rly know. I still struggle a lot with big groups because I have too much time to think, I don't have to keep answering or asking questions like a 1 on 1 convo or with friends wich I am good at. I kero overthinking what I'm about to say way too much that it becomes inevitable that I mess up or stutter wich is fine with friends or a 1 on 1 convo but I still don't want that to happen in a group. Does anyone have some advice for talking to groups?