I had this problem in catholic school, i think most girls did. we weren't allowed to dye our hair, and had the uniform every single day. no jewelry except for a crucifix, and no "weird" hair styles.
Shoes were unregulated pretty much, i guess. that was how girls decided to make a fashion statement, by finding the most ridiculous shoes imaginable. Also knee high socks, we were allowed to have any as long as they were green, blue, white or yellow. people went everywhere finding weird looking patterned sox to make a statement. Looking back, we looked like fools. Nothing you wear should prevent you from being yourself.
I understand the need to stand out, or make your appearance fit how you feel about yourself, but you don't need that stuff. Your personality wlll show your individuality. And if your desperate for some sense of individuality find some boxers that fit your taste. then you can smile the whole day knowing you're the only one with weird unique boxers

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Seriously, just let your image conform but never let your personality conform. That's all you need to do.