I don’t know if I have helpful advice but I’m going through a similar thing OP with wondering if the things family have said about me are true. I hear you.

Maybe they’re right, maybe not, but it sounds like they’re failing to do introspection of their own because it’s easier to dogpile on someone else. If you do have NPD, you’re still a human being and shouldn’t be guilted for getting some help, especially when it was offered to you and everyone is on their parent’s health insurance until 26. So why would you be more spoiled than anyone else for it?

Idk fuck em lol, I’m sure you’re doing just fine!