Hello, Im 14 And My Breast Have Been SLOWLY Developing.

hello, im 14 and my breast have been SLOWLY developing. My whole family have big breast and I'm really impatient with mine, im skinny but trying to gain muscle and weight. Do you have any advice to gain more muscle? and maybe some advice to help your beast develop a bit faster? everyone is picking on me and it makes me uncomfortable seeing every girl in my school with it ones. My family started developing at the age of 15-16 but I still feel unsure