I really want to be a dancer but I've really small breasts. It's kind of embarrassing- do you think I can still be a dancer?

Don't worry about your chest. I've worked with lots of girls who are totally flat.

Different guys like different types of girls, many men prefer a more athletic figure. If it really bothers you just go get them done. But do it because it will make you feel better about your body not because you care what people think.