Is this normal for a teen??..Please Answer!?

hai im 14 and everyone of my friends breasts are growing more than mine. i know it could be genetic but it seemed like they stopped growing for some reason.. will they keep growin?? and i used to have like a medium sized butt but then i started taking hip hop classes and my but has like gotten almost flat and sometimes my breasts will look smaller than they are.. is that normal? what can i do to get them bigger again?!? is there any foods i should eat because i dont want to end puberty with a flat butt and breasts tht sometimes change.. should i stop dance clasS? HELP!!