When did you start talking about childhood/past things in therapy?

I'm curious when were other people able to open up about their childhood in their therapy sessions.

I've just finished my 7th session now and I am always having some current problem or strong emotion that makes me feel like I need to solve urgently. So when I get to my therapy sessions one way or another I end up talking about my current problems. I am also very sensitive about other people's actions and words so when something bothers me I find it really hard to talk about something else.

I think my therapist wants to get to hear more things about my childhood and even though I am not trying to hide anything, I just haven't found the right moment to talk about the messed up things that happened. In a way, I think this might be some form of avoidance. But also current problems and feeling stopped me from being able to dig deeper than the present moment on my therapy sessions.

How long did it take you to open up about your childhood or your past in general in therapy? Did you therapist take active steps into digging deeper into your past or they let you talk about whatever you had in mind at that certain point in time?