Isn't the term Personification?
Personification is giving human traits (qualities, feelings, action, or characteristics) to non-living objects (things, colors, qualities, or ideas).
For example: The window winked at me. The verb, wink, is a human action. A window is a non-living object.
Or I wonder if it has to deal with disassociation?
But don't feel bad. I have conversations in my head. Sometimes I'll have half a conversation in my head with my husband, then actually start the conversation half-way in, when I actually talk to my husband.
In therapy, I have a hard time looking at the therapist the whole session, and I noticed in the last session, I spent most of my time talking to the empty chair on the other side of his office. hmmmmm....I wonder if he picked up on that.