Im about to be 18 and i think i have breast cancer....? Ever since I've developed breast in 5th grade there has always been a lump in my breast. First in my left and then once i got into 8th grade, it spread to my right. I am now a senior in highschool and never told anyone. I dont know what to do. The thought of having to lose my breast scares me. I dont have any insurance on me and i dont kno how to approach my mom and tell her. Im tired of the pain and being insecure when revealing my chest to my boyfriend. Help me please

Summarized question: What causes painful breast lumps in a young woman?