Over the past few months I've noticed that there's hard tissue in my right breast, but not the other. I've read before that teenagers (I'm 17), due to fluctuating hormones, tend to have breast changes.
There's no pain-- even with applied pressure on the tissue, and the nipples appear to be the same on both sides. However, there is pain anytime I apply pressure to my right armpit, if that has any relation.
Since I'm young, and breast cancer is usually in older women, I don't really know if I should worry about it.