What Are The Chances Of Fibroadenosis Being Malignant?

hai..... im an 21 yr old girl not yet married.......i m doing my MBBS final yr....i can feel some thing in my rt breast since 1 month nd i consulted gynaecologist she said mostly fibroadenosis nd gave MECGLA for 3 months........are there any chances f malignancy??? nd i masturbate so i think estrogen cause this???? pls tell me