Shame stems from a sense of inadequacy or guilt.

It could be you're feeling shame, when you are really feeling embarrassed about the topics. Or maybe that's all you "should" be sensing, as shame implies wrong doing, something from a guilty standpoint.

You mention childhood stuff. No child has such control of their life that they need to feel shame or guilt about. Childhood is about learning and growing up. If the child's environment requires doing "icky" stuff that they had no control over, then no shame, nor guilt, is assigned. Children are not capable of controlling adults, or even stronger peers.

I say all this so you can remove the shame that perhaps family dynamics has built into your viewpoint.
A good T won't be embarrassed, as they are not personally involved, and training and experience has afforded them the opportunity to hear most everything imaginable.

I know it's tough for you, but when you're ready you can do this. Don't push, as that might set you farther back in your therapy process. But if you wish to go forward, dispense with the shame. There is nothing there for you.