getting a job when shy!

Aviva
I'm a really shy person. I seem outgoing and talkative but when it comes to adults and complete strangers i freeze up a little. Also, this happens when i'm under immense pressure. i'm really worried cause my moms making me get a job at Chick Fil A this summer but i don't know how i'm gonna remember how to do everything or get people's orders right and not be super shy. i've never had a job like that before. any words of wisdom?