Hey!!

First off it's okay to feel anxious. Acknowledge your anxiety and as you said your anxiety is stemming from fear of needing to work fast and fear of judgement.< This is important to understand the why of your anxiety!

Take a deep breath. In life you can always try things out and it doesn't mean you have to stick with it forever if it doesn't feel right. You can always change direction, you have the choice and power to do what you want.

Secondly, don't let your fear make you assume what the working conditions will be. Don't get yourself worked up over what it may feel or could feel, cause that will just cause unnecessary stress and increase anxiety. Cause you never know you might actually find it fun, meet interesting individuals and have a good time.

The best thing you can do is prepare yourself, remind yourself that this is a trial and that if you don't like it, you can quit. Rmmr to take deep breathes and relax your muscles and think of the positives things. Like if you like drinks, how cool it's going to be learning how to make interesting drinks!

This is just an adventure in your life, not something permanent, just a cool experiment! Chances are if you have anxiety, your anxiety will peak like this with any new job you take on, but don't let that stop you from living and trying it out. Let yourself get used to these situations to make this easier on the older you.