Is it normal to talk to imaginary people in my head?

For example, I've created very life-like imaginary versions of people I know in real life and find interesting, simulations that I talk to if I can't get to the actual person.
Some are mentors to me, some just kind of listen to what I say. The ones that are mentors do answer my questions, though, and bring me insight.

Other imaginary people I talk to are personified versions of parts of me (I don't talk to them that much, they talk to me), such as my self-hate and that's the voice that degrades me if I mess up. There's also the friend that comforts me if Self-hate beats me up.

I know they aren't real. I know I'm thinking them up. But they're very real in my head and sometimes I wonder if I'm actually telepathically communicating with the person when I pretend to talk to them.

Is this normal? It's not causing me any problems, really, other than people looking at me weird when I tell them about it. No one I know does this.