I understand that it's hard to talk about sex and body image stuff with your T. My T is skinny and I'm the opposite. I get embarrassed all the time but I talk about it anyway.

Have you asked your T for help in talking about it? If you tell her you can't, in the session, she can make it easier for you. Ts have heard all of this before, so it's like talking about the weather for THEM, but not for US. I know it's hard to start, but once you do it will be okay. I think there was another thread recently about the same issue. One way is to just "jump in". Say it even if you think you can't. Once I wanted to tell my T a sentence and I started it about 10 times before I could finish it. But I did, and then I felt better.