Tbh, I find that paranoia is something that you believe firmly versus worrying can be a bit rationalized - even if the “paranoid thought” is true.
I like to question myself like a reporter: “why would that be the case?” “What proof do I have?” “Do other people think this way, or is a symptom of my illness?”
I’ve never been diagnosed with a psychotic disorder per se but I’ve been around people who do experience it and the paranoia is typically firm in its belief