i don’t know what to do

im in high school and im white. my asian “friends” keep on being racist towards me and disguising it as a joke. they keep on saying things like [quote]all white people do is bully other cultures[/quote] and other things. they make fun of me a lot for simply being white, and talk to me like i am stupid. they treat me like as if i have never seen anything before and talk to me condescendingly. they have been doing this for a while now and i feel like since i didnt stand up for myself before, they think it is okay to do that.
they hit me if i dont do what they say or protest.
they dont do this stuff to other people, just me.
sometimes i talk normally and they put words in my mouth trying to me seem racist all the time.

they speak in their own language to each other a lot and they know i dont understand. when i ask what they are saying, they talk ti me condescendingly saying things like [quote]oh of course you wouldnt know[/quote], and keeps talking in chinese to the other friend.
i know they bond over the things they have in common, and also over putting me down
i know this friendship is bad for me, and i have wanted to end this friendship for ages. it makes me feel like crap everyday and i dread going to school because of them.

the problem is, other friend groups are already established, and some that seems to be open are toxic in their own ways too, so im stuck. does anyone have any advice?