Yes but I didn't know before someone told me. It helps me not to forget things and stay focus. It's not something I really control or is aware of, I also sing and do little dances out of nowhere in public without noticing and embarrass my family.
I do tend to talk to myself a lot because sometimes I need to remind myself of what I need to do or what I am doing for the rest of the day and sometimes I just want to vent to no one but myself so I can get it out of my system. I try not to do it around others because then they ask if I am speaking to them.
I do in order to stay focused on my tasks, and the order I must follow them. Saying each step out loud and commenting on the progress I'm doing helps to not get distracted.