I talk to myself all the time, I always have. It just comes out as part of the commentary running through my head. I know I'm doing it & I don't care, but I can easily stop if around others.
I do it the most when I'm bitching about something. I think many people don't consider some of the things they do to be talking to themselves. For instance, cursing a blue streak because you hurt yourself, is definitely talking to yourself.
So is saying something like, "Damned phone, never stops ringing!", or "What now!?", when the doorbell rings.
Talking to pets is borderline, depends on the "conversation&quo t;: calling them to you, soothing them, praising them, to a degree, not included. But, other talking to them can cross over into talking to yourself. Of course, talking to a pet fish is always talking to yourself. I talk to the deer, the birds, the squirrels, cats & dogs. I suppose that's all because I talk to express myself, it's what I do. So, why not do it out loud since it comes naturally & I already do it in my head?
And I, too, definitely have a running commentary of sarcasm & other socially non-beneficial comments in my head!
It's how I cope! Obviously, I don't care if I do sound looney tunes.