Is this normal or schizophrenic?

I've just recently had cause to wonder if I was schizophrenic, and have been doing a lot of research about it. I can relate to a lot of the symptoms. I have one habit that I am aware is weird and dont do it in front of other people. Based on stuff I've read in the last couple days I now wonder if this is actually a Sz behavior.

Anyway, the habit is that I will think about meeting someone and then imagine how the conversation would go, and then start having a conversation out loud as if I'm talking to them. I'm not sure if I speak their "lines" or if I just know their answer in my head. (And that's messed up too, that I don't even know if I'm speaking for them too, or just me. It just happened just now and immediately afterwards I couldn't remember that?!)

But yeah, I'll just be sitting there talking as if there was someone else there. I always thought if it as just "practice" for future social interactions, but now I wonder. Is this psychosis? Or something else? Or normal?

Rehearsing a planned conversation out loud is very normal behavior. *Mod edit*