hi, im 12 years old & on Monday May 13, my friend and i were playing around, then she accidently punched me in my left breast, after that, i felt a pain from the breast she hit me in. Today, well just now, i was washing my self up, and then i felt a hard little ball in in my breast. immediatly i grabbed a towel, and put warm water on it. it kind of helped, but now i have some pain. Is this breast cancer? Please help. i'm really scared.