How do I reduce anxiety at work?

I have a recently new job I’m 20. It’s as a barista at Starbucks. At the moment I’m always cleaning the tables and helping customers but sometimes when I have to go on the till and it’s busy I get so stressed and make mistakes since I’m worried customers in the line are thinking it’s going slow. And I get scared inside and panick as I know it’s normal as the manager has spoke how he has felt like that but how do I get out of this. I also get nervous to make the drinks sometimes even though I know how too I get anxious customers are watching me and judging. But then again when I go to Starbucks i always watch how it’s made. Is this anxiety I love working and my job it just scares me when it’s busy. I’m great when it’s not too busy.

How do I reduce anxiety at work?
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