I have NO idea what this is. I thought well maybe Maladaptive daydreaming, but I was in a group for that for 2 years and their experiences weren’t the same at all. 

For as far back as I can remember I have played these different characters. Let me explain. I have numerous characters that I act like. When I am alone I have conversations out loud with myself as these characters. As if they are talking to each other. I mean CONSTANTLY. 90% of my time alone is done doing this. If I am around people these conversations continue in my head. I have been called out numerous times for making odd facial expressions at weird times because even when these conversations as going on in my mind I can’t seem to control my face. These characters are very complex and have strong relationships with each other but I (as myself) do not have any interaction with them. I know 🤦🏼‍♀️ I probably sound crazy. 
I also act out certain things as these characters. I will push air playfully as though I (as a character) am teasing another character and if two are in an actual relationship than I will act out kissing by literally just kissing the air as though the other character is there. Those are just 2 small examples I could think of. Funny enough I consider myself asexual who is very much against the idea of kissing or anything remotely sexual but that just seems to go out the window when I pretend to be these characters. It’s like I lose all sense of myself during these moments.