Mine always talks.
Sometimes I have trouble sleeping at night because it doesn't stop.
It's a calm androgynous voice that is always evaluating everything going on around me, giving me information constantly -- like a perpetual "trivia bubble" that shows up sometimes in movies or music videos. Everything that happens, the voice is commenting on it. it will give me directives to, based on those flashes on insight ("Here's what's going on, here's the best response, quickly now... before the moment passes!")
It also acts as my conscience. When I have an immediate response to something, or an emotion pushes me to respond a certain way, the voice is very quick to evaluate what I am doing or want to do and tell me whether I'm being silly or smart, selfish or kind, prudent or irresponsible.
There is no condemnation in the voice now, although when I was a teenager it would say nasty horrible things to me ("You're a bad / lousy / terrible human being for feeling that way or doing that or saying that!"). Nowadays, the voice is much kinder, understanding, and patient; it seems to have developed perspective.