I’ve contemplated the voice(s) in my head all my adult life, though it’s only recently I’ve thought deeply about them. One big question I’ve had being why sometimes it’s a dialog rather than a monolog.
To be clear, I am fully aware that it’s all me; it’s my voice(s). “They” (or rather “we”) are aspects of my own mind — my inner voice. Something I’ve naturally assumed everyone had.
But some say they have no inner voice!