Dancing should be fun for you so if you do not feel like it then you should not force yourself. However, in a case like this, it is in good tone to not accept invitations from other boys for this particular dance (to spare the poor guy humiliation, after all, it is not his fault that you do not...
Having deviant desires is one thing. Acting upon them is another. Being a paedophile is not a crime but child molestation is. Law usually proscribes severe punishments when there is little else that can be done to prevent undesirable behaviour.
It took centuries of inbreeding for northern europeans to acquire blond hair. When a blonde has children with a black father their offspring and descendants will never be blond again, which is very regrettable in my opinion.