If you're mean, I cry.

I've always had the unfortunate urge to cry anytime someone yells at me or is mean to me. It's kind of pathetic, and makes me look pretty dumb a lot. It worries me now though that I got my first job and I'm concerned because I know customers/co-workers might be mean or yell at some point and I'm pretty sure I'll want to cry right then and there. It's stressing me out thinking about it cause I know customers can be total assholes! Does anyone have any advice? I'm freaking out here