I wear a different school uniform from my classmates, and one child wears a different uniform from my classmates, but all my classmates laugh at me alone.

They are jealous of you and unbalanced. You must be well dressed, but they can only wear the same clothes, not against the school. They can only find an "alternative" to vent their grievances, relax, be themselves, and say that you are the childishness of a group of boring children? Being strong inside is more important than those who only talk about it.