Find out what kind of therapy the group is using. If it's CPT, it sounds like you're not ready. That's a trauma processing group that digs deep.

But a regular survivors group could be good for you. They don't force you to talk. You can hold back as much as you need to. In my experience the conversations center on the emotions, such as anger, shame, resentment, etc rather than the events that happened. It's a group, so the conversation is steered in a way that others can relate, and a good leader will keep one person from getting swept away by their own story. That gets saved for individual therapy.

It sucks that other people are suffering, but a group shows you you're not crazy and you're not alone. I've always felt very bonded to the other group members after hearing bits of their struggles.