Is it normal to have these thoughts?

I know most people have an internal monologue, but I'm not sure if mine is how other peoples are. For me it's typically constant and consists of various voices that I cannot tell where they come from and have no control over, so they don't seem to be me. They constantly comment on everything narrating and instructing. I mostly ignore it but it can become annoying, like last night my mom was nagging about something and they were pestering me to stab her, which I don't like to tell people I have these thoughts, but it happens daily. I'm honestly a bit scared of myself sometimes though as I am sometimes concerned I will not be able to control myself someday. They aren't externally auditory like I would think someone with schizophrenia would have, but I've been diagnosed with that by any therapist I've told about my thoughts, so I'm unsure if I am schiz or if everyone is like this.