I thought I was the only one doing that. Been talking to my self for as long as I knew it. Especially when I didn’t have my phone or much electronic devices, I just sat there and talked to my self. Current day, I sometimes talk to my self while on a discord voice chat with one of my close friends. I do it by accident now on, but I don’t stutter or have difficulty talking when I’m talking to my self. It’s weird. And I don’t really stutter when I read off a page/screen.