so a few days ago I was in the shower when I found a lump in my right breast. my right side has always been a little larger than the left, but I obviously freaked out and read online that one of the signs of breast cancer are that one boob is larger than the other.

I'm only 19 and I have no family history of breast cancer, but what are the chances that I have it? idk if im just overreacting or whether I should request to have a mammogram. pls help!!