This is weird...I do have a "mental voice" - which is reading out as I'm typing this sentence. But i never had an actual conversation going on with myself that I can think of... Is that a thing?
Sometimes, I can think of a series of logical steps needed to get something done. Like, okay: so, to build this feature, we'd need this and that and next something else.
But it's always a rational thinking process, not a "conversation"...