Is it normal to have breast growth at 21 been same size for years now grown dramatically im not pregnant? not on birth control or had weight gain ?

Breast growth: Breast growth depends on both genetic and environmental factors. It is normal for the breast to change size with age. The most dramatic changes are seen at puberty, pregnancy, menopause, with changes in weight and with certain medications. Growth that is asymmetrical or localized is the most concerning. Bilateral enlargement is usually normal, but dramatic changes are worth having checked out.