I never thought talking to yourself was weird primarily because I do that when I'm not self-aware.
The first time I became aware, I was going on about my produce list at the supermarket. I was recalling my ingredient list for dinner that night, and a lady repeated my last ingredient. "Mint" I heard, and that brought me out of my quasi-trance.
We smiled at each other, and went our merry ways.
I have since noticed a lot of shoppers doing the same thing.
I also saw a lot of people talking to themselves in New York, and I loved it! To be completely surrounded by a crowd and be able to make a space for yourself.... For some reason I find that encouraging.