Does anyone know what "structural dissociation" is in layman's terms?

My therapist told me a little about Structural Dissociation. I still don't understand it much at all, but I think she was trying to theorize my personal behaviors and thoughts. I will need to get clarity from her. Ever since we talked about it in session, I've been wanting to stay away from my family, who I am normally (sometimes / sort of / at times) close with. However, I am the one working on myself, not my family. And I'm the one putting effort into my relationships with my family, they aren't (even though I know my mom loves me). I also have been feeling sad about the things I've experienced in my past. I'm not even thinking of specifics. Except my father. Because she (my therapist) brought it up. It's more "I've experienced traumatic events that impacted my development, and knowing that makes me sad." It hasn't just been with my family. Its been multiple events over my lifetime that really had a profound affect on me.

I just want to feel better. I don't want to be sad about it. Isn't there a survivor mentality with trauma too? I want that.