My boyfriend told me that when we started to date, I would talk to myself. The dialogue with myself was something like:

Me: "I'm hungry."
Me: "No we're not."
Me: "I am hungry though."

He said it would creep him out. Especially one time in the kitchen when I was playfully poking a knife at him saying I could kill him, but then having an alternate voice say, "No, we can't."

I can remember these events for the most part, but I do not remember ever speaking to myself. It scared me to find that out today. My mom has a history of severe mental illness. It seems like similar early symptoms. 

Is this common? Is this normal? At the time I was on medication to treat bipolar disorder I. I am off my meds due to my pregnancy. Seems like I haven't done this recently, but it still scares me nonetheless. I told my boyfriend to let me know if I am doing this, since I truly don't remember.