It's OK to be scared; it means you're paying attention to your health, which is good. But you also need to understand that having breast cancer during your young teen years is very unlikely; our message to teens about breast cancer will give you lots of great information about why this lump almost certainly is NOT cancer.

At your age, lumpy breasts are very common; they're part of puberty, and signal the fact that your breast is about to grow. Please read our teen guide to breast development for more information about puberty, and how your breasts develop.

Now, all of that said, please don't let a fear of doctors stop you from talking about this with your mom, or another responsible adult. Maybe there's a reason you should have this examined by a doctor; perhaps there's some breast cancer history in your family you don't know about. At any rate, rather than worry alone, share it with someone older; you'll definitely feel better once you talk this out with an adult, and it's important, at your age, to continue to share health issues – with your parents, if possible. Good luck - PJH