Try doing some anxiety-relieving practices throughout the workday, so you are more calm during the day at work and will have better conversations with people during your shift. Try easy things you can do during any time of the day, or during a free moment of time: simple breathing exercises (breathe in for eight, hold for four, breathe out for eight, repeat up to ten times), a relaxing image on your phone (there are anxiety-relieving apps or images you can quickly look at for a few moments). Or, before work, you can try doing breathing exercises or something that relaxes you (in the car or when you wake up). The nerves probably come from a sense of anxiety around professionals, which is super common. Try to remember that, although the people are professionals, they are JUST people and will treat you with respect as long as you do the same!