I used to wear a vest, but later I changed my bra and my classmates laughed at me.

Hello, you should not only continue to wear it, but also choose good fabrics according to your age (because you will continue to develop). I was dressed too late, and I had the same mentality as you. I regret it now. Later, I spent a lot of money on underwear to correct my chest shape. You should adjust your mentality and don't worry about their continued ridicule. In another month or two, no one will be bored enough to continue talking. But two years later, those girls will regret not making such a decision like you, because ugly breasts will affect their confidence in their future life. Whether you are new to the workplace or shopping, you feel that you have a different style. This feeling is very bad. Stop wearing a vest:)