I know exactly how you feel. I too go through the same feelings. I cannot stand it if a customer is upset about something. And whenever I mess up, I can't help but feel "This is it for me. They are sending me home."

What has helped me so far is practicing relaxation techniques such as breathing. When I'm home alone, I imagine myself in a stressful situation, and I take in slow and deep breaths to sooth my nerves. Then I try it when I'm in the actual situations.

When it comes to my bosses getting upset I repeat to myself over and over "It's not that bad. Everyone messes up. You are human and so is your boss. They are only doing they're job."

It's hard yes, but these have helped me so far. If you really feel your bosses are that upset with you, maybe it will be best to talk to them.

I see a counselor too to talk about my anxieties too. That's helped a lot.