Why are breasts laughed at by many boys in the class?

Hmm! This kind of thing will happen in our class, so I often wear a coat, and my classmates often laugh at me for wearing so thick on a hot day! But don't feel embarrassed, although I can't help it, it's a bit embarrassing! But I just want to stand up straight. Don't be embarrassed. It's normal! Come on! Those boys usually laugh at you when they encounter problems. Don't take their words to heart. The more you think about them, the more embarrassed you feel.