I know what you mean...I haven't said anything in public yet, but I even make up people that I have conversations with in my head. It's difficult not to speak out loud to them. I also refer to myself as "we" and talk back to characters in video games. I don't know if it's exactly the same thing, but I know I talk to "imaginary friends" because I'm so lonely and have no one to talk to most of the time and I almost always feel like I need to talk to someone, something.