@anna
"Subvocalization" is pretty normal but not every person does it:
https://en.m.wikipedia.org/wiki/Subvocalization
Most of the time it is my own voice. But when i read something interesting like a fantasy novel I "synthesize" different voices for different characters. I can also "borrow" from my memory i.e. David Attenborough could do the narrators voice in Terry Pratchetts "Small gods" if I wanted to.
I also have inner dialogs all the time discussing things with "my inner selfs" - also common and pretty normal.
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