Dealing with Paranoia and Trust Issues

I've recently noticed that I have a lot of paranoia. I'm always searching for red flags in people. I'm always nervous that they're going to screw me over in some way. I'm uncomfortable around others. I can't tell if this is a trauma response or something else... But it bugs me. I want to be able to enjoy things, hanging out, making friends, that sort of thing, but I just can't. I keep cutting people out because "they display red flags" and I'm starting to realize it might just be me, I might be too critical of people. And I might've just ruined a bunch of relationships.