I used to think only fictional characters(like on tv) do that until I found out, not long ago, that some people actually do so, in their mind, and some say with their mouth(thinking out loud).
I never did so, but I found this fascinating.
Only when I feel the need to talk my problems out. It's an old habit that I have, but I describe them as soliloquies for myself. However, I only do it when no one is around. Also, as someone who believes there's a creator, I do feel that when I do this someone is listening to me. I actually even feel at peace. I think of it as self-encouragement.
I know of a lot of people who do this and don't like to admit it, so I know I'm not the only one. Don't be shy ;p
Oh lawd, for years I did in my head out of habit (maybe from so much time spent alone?)
Then, rather unexpectedly flipped into a manic episode and without even realizing it I was having conversations with myself out loud and rather freaking my family and others out.
I don't anymore, in my mind or otherwise, aside from thinking out loud upon occasion.
Yes i talk to myself ALOT. If i had a fight with somebody i walk around the house in circles and talking to myself like there is somebody else in the room :) you know like:
Me: I think i know why he did it, maybe because of...uhm...argh how to explain...*10 secs later* argh you know what i mean right?
Me: Yeah. Okey
And i do this for hours :) Yes i'm a troubled Individual.