Mom won’t let me dress like a vampire for school.

So tomorrow we have an activity where you can go dressed as whatever you want meanwhile it’s the opposite, like you match with someone and that someone has to be the opposite of what you are. Me and my super cool friend decided to go as vampires but as a goth vampire and as a white goth vampire. I was choosing my clothes when suddenly my mom came over and said you can’t go as a vampire bcs everyone will make fun of you and shit (mom is mad im cool and she’s not) so I was like ok?? I mean they already make fun of me so I’m going to give them a real reason to make fun of me (im better than them) anyways, now idk what to wear but I still wanna go as a vampire :[