Hi there,
the statistics say that 2% of breast cancer is male. So don't think you are strange having concerns over breast cancer.
I think, to put your mind at rest, you should ask your parent or some other adult whom you trust to take you to a medical doctor for a check up. Hopefully it is absolutely nothing to be concerned about and you will be able to put your worries behind you.
Take care....... This comes with a hug