My anxiety makes people awkward

I have bipolar and anxiety disorder. I am terrible at socialization and I tend to make people feel uncomfortable around me. Or maybe that's just my anxiety talking. I work at burger king and it is horrible. The managers change each time I go there with their own rules and I always fail to meet their demands. They always call my name twice and question me repeatedly because I'm too reluctant and uncertain about my decisions or their questions/commands. I want to be more certain and aware but no matter how hard I try, I fail. Even things that I know for a fact is correct, I still can't make the initiative to perform them. The managers and team members treat me like I'm retarded and honestly I feel retarded. I hate having these illnesses. I want to be normal.