*Do not* skip over telling them you're autistic.
Matter of the fact is that at Gamestop, you're very much better off being social with the customers. For the moms and pops buying games for their kids, they're gonna wanna know if it's the right game and what their kid wants, etc. For the gamer, a lot of them tend to get into casual conversation with the workers, I know I do.
What you can do, is see if you can focus most of your work behind the scenes, with the stock and testing games and products, etc. It gives you great hands-on work, and you don't need to worry about dealing with costumers.