why do I think everyone is talking bad about me?

i constantly find myself paranoid that everyone around me is secretly conspiring about me and are acting nice to me to keep my guard down. this paranoia has even manifested onto my professors, as I genuinely believe many of them share a laugh together about how annoying I am. It might be rooted in some truth but I'm always thinking like this.

I also have another paranoia that someone will try to take down my career and cancel me if I ever were to become extremely successful. I've made some mistakes in the past, had different beliefs than I do currently, and posted many questionable things as a teenager, which I feel anyone that I've ever wronged will use against me once they see me doing well.