How to hide makeup at school?

So I go to private school and ive been sneaking wearing concealer and foundation but it alwayz looks bad during the day... EXPECIALY on gym dayz because our gym uniform haz no pockets and I cant leave it in my locker cause they could check the lockers..im 13 and how should I do my hair up without looking like a guy ( I have a side bang) And my hair looks flippy because of my layers if i braid it...I use primer and a face moisturizer so how do I hide my makeup or just put it on so it looks amazing all day.. we dont have any showers that we have to take or anything so im okay with that part.. please help me out! Peace! (Ps. Sorry for bad grammer.. Im in a rush and I know im typing half of this messed up but hopefully you can still read it)