I'm a 38 year old piece of shit. No friends. No romantic relationships. Kind of at odds with my coworkers when they attempt to interact with me in any capacity besides professional. I think it's because I was bullied a lot growing up, which taught me that people only want to interact with me to hurt me. How do I unlearn the truth?
Dunno
Tried therapy?
You could try trusting people again, and putting yourself out there again. Not everyone is evil.