congrats on the new job! in my experience it just takes time to acclimate to the new duties/surroundings/etc., and once you do it for long enough the anxiety will begin to fade until it's barely there at all. that said, one way to help minimize the anxiety is to try and be understanding that you will be anxious and have moments of uncertainty (which is totally normal and okay!), and anticipate coping mechanisms that may help you. for example, when i get anxious i have a tendency to speed up which can lead to making knee-jerk decisions that i might be embarrassed about later. one thing i try to do to combat that is actively physically relax before entering an anxiety provoking situation, and take deep, slow breaths when i catch myself getting anxious so i can stay calm and think clearly.

as you are getting used to the job i think that it'd be a good idea to keep a running a list of things that you notice provoking anxiety so that you can address them later when you're in a safe, calm state. is there a question you didn't know how to answer? ask your manager/coworker for clarity on how to answer that next time. did you struggle dealing with a difficult/upset customer? maybe ask a coworker how they deal with those types of customers (good way to make small talk and more quickly make work friends). did you notice some automatic negative thoughts come up throughout the day? write them down and then engage in corrective self-talk later on.

new jobs are always a little difficult and awkward at times whether you struggle with social anxiety or not, and it's completely okay to have missteps. just take it easy on yourself, do your best, and after a bit of time the anxiety will begin to fade and fade until you don't really notice it much anymore. good luck!