Ironically, that’s what James Earl Jones used to say too. He used to comment about how when he was alone he could talk just fine and I think he said it was when he was talking to his animals that he was perfectly fluent. I am the exact same way. I work by myself. There’s rarely ever anybody around me when I’m at work and I talk to myself all day long perfectly fluent, in fact, right now I’m using speech to text on my phone and everything is fine. It’s not until I get around somebody or somebody can hear me when my fluency goes out the window. My therapist used to tell me stuttering is what stutterers do when they try not to stutter I’ve never forgotten that.