Idk much about "normal"... I guess that's something you gotta gauge internally. (Subjective). As far as internal Dialogue , I do it all the time... I'm not generally distressed by it although I do know the embarrassment of relizing I am in public and actually doing it out loud or mouthing along and making facial reactions as well But I feel personally that it is generally just a way of processing and sorting feelings.... I think it is only problematic if you find yourself stuck repeatedly on certain scenarios ( ruminating), harshly judging yourself over the shoulda coulda wouldas, and/or can't engage in the present when it matters thus missing new info cuz u are too focused on the past, for me that doesn't really include autopilot tasks like the supermarket or daily transit route. I feel we live in a world that doesn't accept the need for proper amounts of quiet time, so I process while doing the dishes, walking down the street, in the supermarket etc... I guess my rather overly detailed derailed msg to you is this..... If you feel it helps you deal and more forward (healthy)... If you find it distressing (seek help)