Is arguing with myself normal?

I don’t know if arguing with myself is normal everyone is telling me it’s normal but when I search it up it’s in a completely different context, other peoples arguments usually have to do with decisions making but mine are always degrading for no reason. I

’ll be in the shower and all of the sudden my brain is using my mouth to talk bad about me, suggesting SH, and remind me stuff that I wanted to forget so I talk back of course. I just want to know if anyone else deals with this