Will I be able to work at a department store if I'm not pretty?

I know this is a silly question stemming from my insecurities, but I've been wondering this lately. I wouldn't say i'm ugly, but I'm definitely not sexy. I'm cute. I'm short, curvy (not fat, I'm around 130 pounds), I have glasses, short hair, and I don't wear a lot of make up (foundation, mascara, and lipstick at most. i cannot do eyeliner to save my life). I look like a freshman in high school, but not like a freshman in high school that you'd see on television or in movies.
Every time I go into a nice department store that I'd like to work at, I feel like I wouldn't get hired there because I don't have than long, lean, and sexy look like so many of the female employees and customers have. Sometimes I even feel too intimidated to shop there because I feel like the store isn't for people like me.
So is this probably all in my head or not? Do you often see cute but not sexy girls working in department stores?