I mean, I talk to myself maybe sometimes but that's actually vocalised either out loud fully or as like a whisper. I don't do it all the time though, thoughts are intangible, they're not individual words to me, they're more like clouds, and when thinking about an extremely complex problem it's more like a whirlwind or storm with clouds of thoughts forming from it.

It's not a monologue to me because it's much more complex than just speaking to myself, which does not happen in my head unless I consciously try to do it.