I am a maladaptive daydreamer. I mostly think in conversations. Like, I imagine the other person's part. I also have violent fantasies, but they are intrusive and I generally push them away. These are the most maladaptive thoughts I have, the rest, I can accept.
I'm not sure how to get rid of the habit. I guess I would have to have more irl relationships, but one of the ways I deal with contact to another person is specifically by daydreaming conversations and going over past conversations. Daydreaming is kind of an integral part of a relationship to me. If I don't have the time to process that way, I get overwhelmed and overloaded.
Not sure what to tell you, but I hope that helped in some way. Personally, I'm not working to get rid of the daydreaming, I just work to replace the severely maladaptive parts.