Person Inside my mind?

When my grandfather wanted to think something over, he'd say, I've got to talk it over with me, myself and I. I'm always second guessing myself, although I don't really think of it as a "voice" in my head, I know it's all me. Life is full of choices and decisions, sometimes we listen to our gut feeling and when things go wrong, we moan "I knew I shouldn't have done whatever, something told me not to". That's just the way we're made, we can actually argue with ourselves.