I do this all the time. My earliest memory of talking to myself was when I was in kindergarten, the awakening 'Helen Keller' moment when I realized that I was a being with my own mind (when does people usually experience this? I was a late bloomer). It was at school, in the long aisle that connects kindergarten with higher level schools. I started to talk to myself more often after that, I guess.

The second turning point was in high school, 3rd grade. My English teacher (whom I love so much) told us in the class, that if you want to excel in foreign language (English) try thinking in that language. And so I did. Not only thinking but also talking out loud. To myself. I am by no means very good in English, but I do train myself to get used to think in English and I believe that helped my fluency a lot over the years. I also blog in English, if that's not obvious enough.

And about talking to yourself thing. I've lived abroad alone for a long period of time, and it felt so lonely I talked to myself more in my Japan era. Sometimes, I do it in public unconsciously and when that happens, I usually whisper 'stop talking to yourself!' as if it would help.

I still do it all the time though. I sometimes refer to me and my conversation partner as 'we' or 'us'. And I was also that conversation partner. I feel like Gollum.

I also talk to the mirror.

IDK, I don't think this is weird at all, it's just what some people do when they're alone or lonely I guess. (Okay, I am weird but I'll try my best not to do this in public, I promise)