Please stop talking to me..

I have a nine hour shift coming up in the next few hours, the first one in so long. I've barely worked in the past 6 months because they don't like scheduling me, I'm already not a social butterfly. Since I'm a cashier I have to talk to everybody that comes in and offer help at the assisted self check out and MAKE CONVERSATION (per my bosses words) I get my hour lunch, my coworkers all love to talk and don't take hints with headphones and will have a full blown conversion with you even if you have headphones in.

I had four hours of sleep, I have to deal with a "wonderful" assortment of customers today and really don't want to deal with anybody else more than I have to. Times like this makes me wish I had a car or a private place to just sit and not hear anybody else at this godforsaken place.