I am TERRIFIED for my first job! advice?

Okay so i just turned 16 thursday and i have never worked day in my life before. I think i'm going to be working at this little outside snack bar that serves ice cream, hot dogs, burgers, sandwichs and that kind of stuff. I've literlly never worked before so i just don't know what to expect, and also i'm pretty shy so i'm afraid i'm not going to be able to talk to people, i'm a little slow sometimes especially when i'm nervous which i definitely will be working so when my employer shows me what to do i'm totally going to mess it up and embarrass myself and not know what to do! I've never made like hot dogs and hamburgers and like ahhh how am i supposed to just learn how to do it? and i'm afraid my employer will be an asshole and when i mess up they will yell ( i know i should get over that but i'm scared) so yeah basically i've been putting it off because i'm so nervous but i need to do something this summer and make some money and learn responsibility so i really need to just be able to do it but i'm literlly dying i'm so scared. The first day of work i'm gonna have a friggin panic attack.