As someone who "being myself" actually caused me to LOSE friends, I kind of feel like for some of us, there's no other way to interact. For me, it's not as simple as just being myself and everyone will like me. Just realizing that some people find my attempts to socialize (and seriously struggling to do so) cringy (and apparently annoying and frustrating as well) just makes me want to isolate further.

As for people reacting negatively to your advice, were you making sure your criticism was constructive (as in specific and positive as opposed to vague and negative)? Are you making sure you don't come across as superior/smug or judgmental? I'm also not sure how often it's another person's place to try to help someone who apparently tries to hard, to be completely honest.