Getting used to having the tender underside of your penis rubbing against a dance belt's fabric is one of the hardest (pun intended) challenges of wearing one. Since your penis naturally hangs down, the vast network of nerves there are unused to friction (even if you're circumsized,)except as a prelude to orgasm.
The result:dance belt rubs against penile nerveslittle head goes "cool, let's get hard"big head goes either "uh oh, every guy in this dressing room is about to get a viewing, better hurry up dressing", or "ouch, it's getting awfully crowded down there, and that thong is stretched way too tight. Hope nobody notices."
The only solution is get used to the feeling by wearing your dance belt as many hours as possible, even outside class.
Moving on to your opinion that "your cock looks retarded..." If you take the care to orient your penis and testicles straight up, you should end up with a smooth Ken Doll bulge that has the classic male dancer line. ...Of course Ken might also be retarded. Nobody has ever heard him speak.
"what's a normal one called?" I have no idea what you are asking, so can't offer any advice. Please write again explaining this question.[/i]