Struggling with Work Anxiety and Negative Environment

Soo..I started working about a month ago. doesn't even feel like a month tbh because my anxiety is killing me! I work in fast food and its hard to remember things and I'm always back talking my boss. I got written up because I didn't attend a meeting and didn't let her know I wouldn't be making it. sh*t is already going sour. Then to top it off my mom doesn't understand "sensory overload" and wants to talk my dang ear off soon as I get off work. I'm seriously about to go to a shelter. I need to be around positive people.