I have a job interview in a couple days and I’m freaking out!!

I’ve never posted here before so if somebody has already asked this just ignore. And I’m on a mobile so yeah.

So I haven’t had to interview for almost 5 years. I recently lost my job (non-pandemic related) and started looking for a new one. I got a call today saying I have a interview in a few days. I don’t know what to do or say! I’m very awkward when I meet new people until I get comfortable. I’ve also been told I look like a bitc* when I’m nervous. I don’t want to come across wrong or say something stupid. Can anybody please help me?? I don’t even know what is “appropriate” to wear since it’s not a “classy” job (it’s a cashier position at a gas station).

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