Worried about my new job!

[ekt]

So today I got hired for my first job! I'm going to be a cashier at a grocery store and I start in three weeks Well, at first I was really excited to make money over the summer, but then I started to get nervous. I'm not nervous about the actual job because I have experience working on cash. What I'm really nervous about is the people. Every time I go into the store, all the people working there look as if they're in their 20's, and I'm only 15! Plus, I'm not the most social person... I have friends and we hang out, but I just don't go out as much as some people do. I'm really bad at talking to guys, and they're never interested in me. I don't have great self esteem so I think to guys I come across as shy and awkward. I'm really worried that I'm going to be the loner at work who has no one to talk to! Also, we get a 30 minute break during our shift to eat lunch, and I'm really worried that I'll have to eat it by myself while everyone else eats together please help, advice from people who have worked at grocery stores or as cashiers would be great! I don't want to be this nervous for three weeks! I want to enjoy the first bit of my summer before I have to work thankss, and sorry this is so long haha