So, I'm curious to know why someone would be resistant to talking about things in therapy.

Here's my issue; I've been with my therapist, who I absolutely adore, since January. I'm very comfortable with her. But there are certain subjects that I can't seem to force myself to talk about. Yesterday she asked me to explore reasons for why I may be resistant to it. We were talking about my parents, and she said that I never talk about my dad. So I did, about how I'm comfortable with him and have nothing ill against him. Even though she pointed out that to me, a hug from my dad is awkward but a punch feels normal. I seem to have a complete block to talking about resentments towards my dad. And on the same token, I seem to have a complete block to talking about attachments with my mother. Because I hate her, but some weird small part of me is horribly attached to her. She says I need to give these parts a voice. She wanted to know if they had a voice, what would they say.

I honestly don't know why I'm so resistant to talking about those things. Like when we talk in therapy, I'll sometimes have thoughts start to pop up, but then it's like something squeezes my throat and it's like someone turns the TV off in my brain and I can no longer think. Not even just about the subject matter, for the rest of the day I have great difficulty being able to think about small things like what I want to eat or what I want to do.

So I was wondering if someone could help me find reasons as to why I could be so subconsciously resistant to this part of my treatment?