Is it normal that i talk to myself like i'm talking with someone else?

Sometimes when I make decisions or think about anything, I talk to myself, but it quickly becomes a extensive conversation with another me and sometimes it lasts a long time. I usually discuss different opinions, decide which one is best and even exchange insults. Sometimes the other guy mock someone in a really bad way and I scold him. Of course, everything happens mentally, otherwise i would definitely see a psychiatrist. Usually people just talk and don't start a dialogue with themselves.