Ethan, I'm sure this has you worried, but breast lumps in young men your age are quite common, and nothing to worry about. Here's what our National Institutes of Health says:

"Teenage boys may develop breast enlargement and lumps because of hormonal changes in mid-puberty. Although this may distress the teen, the lumps or enlargement generally go away on their own over a period of months."

So, unless one of these lumps turns painful and seems infected - like, your breast swells, and becomes red and hot - it's probably OK to wait it out. It would also be good to share your concerns with an adult you trust - if you're shy talking about this with your parents, maybe an uncle, of family friend. It's always easier to deal with fears when you've shared them with someone else. Good luck - PJH