If you’re autistic: social settings have a plethora of unwritten rules that you have to follow to not seem weird to non-autistic people. Without knowing exactly why anyone would be badmouthing you, it’s likely that you already violated dozens of them without knowing it.
It’s possible to learn it though, I did it through reading about it and carefully observing soap operas scene-by-scene, watching every movement they make, every way they express themselves, guessing the purpose and seeing the effects.
The quickest way to learn is by having someone with the necessary skills observe you and giving you pointers, but this is hard to do apparently since you have no one you can trust?
I could help, but to help you, one really needs much more and much more specific information about your situation.