Breasts are basically made up of fatty tissue. If you look at professional beach volleyball players, the women are basically flat chested because they have almost zero body fat. Hormone levels, stress, weight gain, etc can all cause an increase in breast size. You can continue to develop and grow up until your early 20s, but typically you will have a very similar size chest to that of what your mom has. If your mom has large breasts, then most likely so will you. Take care.
your breasts are mostly fat pockets. I have a few questions. Are you eating healthy? Do you workout at least 30 minutes a day? I am 15 but I know that my breasts are done...but you never know if they will grow more. A 36C is not that bad! mine are 40DD!! That make you feel better? If it's not weight that your struggling with it could just be normal or it could me nothin...normal. Hope this help! God bless you!