I used to be like you.
Then I socialized outside.
Seriously, go to a local live show. Start small talk with people of similar interests. It ain't hard, and they're goddamn everywhere...moreover, the trust thing ain't gonna happen overnight. What are you doing, leaving them with your car keys and be like, "Hey, don't shit on those." and you keep hanging out with the people that shit on your car keys? How vulnerable are you making yourself where a strong bullet-point in the PowerPoint Presentation of Angst is "TRUST?" Just be selective with what you ENTRUST upon people. Again, this ain't hard. You'll grow out of this funk, just give it time, and most importantly, effort.
"I sail through a golden nexus. By tanks with armor that glisten. I watch and I play with creations, and what I'm not reading, I listen." <-