I'm so sorry Nadi :( I've been in this situation before, and it is NOT fun!!
The reason they bully you is because they feel low about themselves- they have to push other people down to make themselves feel better!! It's not you, it's them :/
Now, I would tell an adult, your parents, or your teacher about this. It is not a fun thing, and I imagine you want it to stop!!
You could always try and work things out with your bullies, or even befriend them. Kill them with kindness :)
Just know that it is not you, and to keep your head held high!! Best of luck :)))