Just adding that I totally do this, rehearse and repeat conversations to myself. Sometimes for hours, though since being on meds I haven't so much. Like you, I don't hear voices or get responses -- sometimes I remember the responses if it was ever a real conversation, but if you heard me you would think I was on the phone with someone.

I dunno, sometimes it's nice to hear that other people do the same wacky things you do, and that it's not just miscellaneous weirdness but part of an actual diagnosis. to be honest that is why i was glad to get a diagnosis, though I know a lot of people don't feel that way, but it made me feel less like I was from another planet.