There is a term for this: “inner monologue”, though not everyone experiences it. I am a native English speaker and have always had an English inner monologue, b

There is a term for this: “inner monologue”, though not everyone experiences it. I am a native English speaker and have always had an English inner monologue, but many years ago when I lived in another country and started to lean the language to the point where I was fluent, I actually started to have an inner monologue in that language! And when I returned to the US, it took me quite some time to return to a fully English inner monologue.