How to build confidence to wear what I want again?

Last year I used to wear all the cool outfits I wanted while experimenting with my style and even though it was nothing crazy I was enjoying it until one day this boy said “she thinks she’s a princess but she’s actually a troll” and him and his little girl friends laughed and went “omggg ur so mean” like…. Anyways I also used to get looks all the time like shocked even tho my outfits were just baby tees and jeans half the time but now I’m even nervous to wear something as simple as that and started to hide behind hoodies and zip up jackets. Maybe only a sweater if I’m lucky.

But I really wanna start wearing short sleeve shirts or even tighter long ones again and experiment with clothing how can I regain the confidence to do so?