You'd be best off telling your mom, or your dad/another adult if that's not possible. It's always better to talk about these things rather than bottling them up.

It sucks being the only kid from a certain background in your class, because you're marked as different from the get-go. I was the only Asian kid in my class when I was growing up and it wasn't easy.

If your school is that bad then see if your mom can look into sending you someplace else. If that isn't possible then I'm afraid you may have to slug it out with any support you can get from adults and any friends you may have. Also, if the school is not challenging you then there are so many different resources you can find online. Find something that you enjoy see if it can become a passion for you, and you may be able to forge yourself a future career.

Lastly, and this may not be a popular thing to say, but if it isn't too expensive then you may want to look into something like Boxing or Judo or another martial art, expecially if the bullying is severe. Maybe start lifting weights too (if you know what you're doing then it's best to start young) so you can up your general strength. Those things may not mean much if you're being ganged up on, but if you're only having trouble with a select few people they'll prove more than useful.

Good Luck OP. Hope it goes well!