Whats Happened to Brent Street

ok, so anyone out there who is a professional and worked in the dance industry, can you answer my question. i am concerned about building up huge muscles in my legs. i have been told that acrobatics and tap can do this. atm i am doing all forms of dance and feel that my thigh muscles are getting too big. i am in my mid teens. i get conflicting opinions on this subject. while i want to do as much dance as possible, i do not want to get too buff. any tips......? it was actually a ballet teacher who first told me that the dancers these days are getting too big muscles, but she did not tell us how not to, apart from do no other form of dance than ballet. any information on this subject would be very well received.