I guess we all talk to ourselves in some fashion or another.
I talk to the animals. Tell them to wait a bit I'm on my way guys, I'm running as fast as I can (stumbling more like it) and stop your crying you have enough fat on you your not gonna waste away waiting for me to get you food. LOL
I however, will not get involved in an argument with myself. That's when I draw the line.
I think it's healthy, most likely a stress reliever. Mind you I do not talk to myself in public, except for the odd swear word. OK OK, it more than the odd swear word, more like a dictionary of swearing, that just rolls off the tongue. All in good fun. Get the "F" out of my way you *&^. And you thought I was a polite little ole lady. Fooled ya!