This will be a reason to see a doctor if your "internal interlocutor" suddenly acquires signs of a separate personality from you and starts advising and even demanding something of this kind. Although in this case you most likely will not go to any doctor - others who are concerned about your behavior will. And by itself the so-called. internal dialogue is a normal state of any person.
It's kind of normal for everyone, but if within reasonable limits. Many artists or lecturers work through the numbers in front of the mirror, pronounce certain nuances. This helps a lot in such situations. Self-talk is useful for getting the nuances of a worrying issue out of your head. There are only two serious drawbacks. When this becomes pathological, one looks for solace in imaginary friends from being alone. Another disadvantage is that any imaginary interlocutor will always tell us the expected answer, since he is a product of our own consciousness, therefore such conversations are unproductive, far from a real discussion.