Maybe they don't know that you would like help to bring things up?
And maybe they assume you already know things and that's why they didn't offer you terms and meanings etc? When I started all this therapy stuff, I haven't been explained lots of things. Over the years I found out things, read about things and now I wonder why I haven't been offered information then.
I agree with above. You could write in short what you want to talk about and tell them it's hard for you to start talking about it and you would like them to help you.

About the SI, m T doesn't ask me about it either. I once told her in an email how bad it was. We talked a little bit about it in the next session. But she hasn't asked me about it after that session, while I was doing really bad for many months. I was afraid to bring it up. I still think about it, but I don't tell her. A few times I was really close to doing it, but I didn't tell her that. I get the feeling she doesn't want to talk about SI. She is a great T, but I wonder why she doesn't check in with me about those thoughts. Maybe because I've said that I (probably) would never act on it? Maybe T's are just oncomfortable talking about SI? My pdoc does ask me about it.