Dealing with Irrational Fears and Expecting the Worst

I have irrational fears because I have rationalized people's actions for so long that I've grown to expect the worst and accept the worst reactions that I'm terrified of. So I think it's completely reasonable for people to overreact and that creates this fear and pressure to except being mistreated or isolate. And a huge part of who I am is I don't see any other options. I seen as black and white. And something in me ingrained in my personality does not have the ability to understand that it is unusual for people to be abusive and aggressive. And I'm actually safe in those situations where I feel terrified that someone is going to flip out on me and Trigger panic attack and I don't know how to not fear having a panic attack in front of people because I rationalize people overreacting when I exhibit my symptoms I've grown to expect it and seen as acceptable for them to mistreat me for having panic attacks even though it terrifies me.