Split personality disorder?

I always feel like my brain is split up. One part of my brain is constantly thinking racist, incel, homophobic, and flat out mean things. The other part is trying to shut it down, and telling me not to ever think those horrible thoughts. My bad side is always the one to think first, so I assumed the good side was just a filter, but it always feels like it’s evolving into two different brains thinking separate thoughts. Is this normal? What should I do?