I talk to myself all the time especially when I'm really trying to concentrate on what I'm doing or trying to figure something out. I also talk to my cats, I pretend that they talk back to me (they kind of do with their noises they make... I just make up what it is they're actually saying). The other day at work I was really trying to figure something out and a co-worker came by and was like are you talking to yourself? and responded, "Yes, it helps me stay focused" and she was like oh... OK!