Does grade matter in United Worlds Scholars?

HI so I am a Korean girl who was born and raised in Hong Kong. I am kind of fluent in Korean, I used to be fluent in Cantonese but it started to fade away as I grew up, and now I can speak some canto and I am 100% fluent in english. I am extremely passionate about drama, English and film as it is what I want to do in the future. What my dream job is, is to kind of have a tv show like Ellen DeGeneres (she is my role model), I want to make people laugh and feel happy because it makes me really happy too. My friends tell me that I am a very funny person and that I am fun to be around which is great I guess. I also want to help kids in bad financial situations as I have been through it, and still going through it, and I know how much it sucks and tears families apart. I get A-B’s in English and for drama I get B’s, but for math I get F’s (i know its really embarrassing and it really sucks) and for biology i get E’s and D’s (sometimes for D’s), and finally in chemistry I get pretty much F’s. I want to apply to UWC because they say that it is the best way to travel and find out about different cultures and backgrounds and you even get to help people in need, and it pretty much sounds like something I would love to do and also be passionate about. Also one crucial reason I want to be accepted into UWC is because the school I go to here makes me feel isolated and it makes me feel like I dont beling anywhere and I also feel that I am costantly being judged for not being good at the mathematical and science areas and I just really really hate it here. I am really worried that my science and math grades will get in the way of me getting into UWC which would really suck because I really really want to get in and experience the many cultures and the many things they have to offer. So if anyone can answer this question it would really really help me out.

P.S. the boys in my school are absolute dickbags who are racist, sexist and homophobic and I really really hate it. Due to the ignorance of the boys in my school makes me really want to change the world in a sense where they can be aware and not be racist, sexist or homophobic and etc. I also want to tell kids that its ok if you dont do well in school because there are so many open doors in life and be an inspiration

sorry for the essay of words I am just really nervous.

Thank you