Suggest Remedy For Lumps In Breasts

Hi, I have a problem. I'm a 19-year-old female and I did something very stupid. When I was 9 I realized a lump had formed in both my breasts right beneath the nipple. I didn't pay much attention to that since I was just a kid and thought it's a part of development or something. However, the lumps kept growing and by now they form basically my whole breasts. I never told anyone about it and I still haven't had it checked because all my childhood I thought it's okay and normal and everyone has that. Then I became concerned but never found the courage to see a doc or tell anyone about it, even though I know I should have. I've never had ANY health problems and I feel fine. I remember I've had blood tests done when I was 13 and everything was OK. I'm a non-smoker, I do sports regularly, eat helathy food etc. My breasts look absolutely normal but the large lumps are freaking me out. I know I need to get it checked asap, but is there any chance these lumps are NOT cancer? Would it be too late to treat it if the lumps were really tumors? I was dumb not to tell anyone earlier but I was a stupid kid and then I thought it's too late to do anything about it. Please don't judge me.. thanks so much for your advice.