I just wanted to say I'm thinking of you. I don't think anyone ever feels "comfortable" talking about such things but if it's making you panic or seems too much, then know you don't have to. And if you start to talk about something, but suddenly don't want to, you can just stop. CSA involves a loss of control and it's really important for you to have control now.
It sounds like your therapist understands that. But it's a difficult situation for therapists, sometimes, because CSA involves some adult turning a blind eye. So the therapist does not want to leave CSA unaddressed (since that could replicate past neglectful adults who did not see/help and instead ignored it or were in denial) but at the same time cannot push their clients to go where they do not want to, because that could be seen as a violation similar to the original CSA. It's a delicate balance.
When I blurted out stuff related to CSA I had a very strong reaction after the session, a kind of fearful reaction because this stuff is generally kept very secret and telling someone can induce panic because you've broken the unspoken "rule" that you're "not supposed to tell." Take care of yourself during this time.