Words won’t hurt

At the schoolyard I am allowed to stand with a group of six girls. When I say something, they laugh loudly. I prefer not to say anything. They never ask me to come to birthday parties. But I don't mind. I don't do well in crowds. I am always happy when the break is over and the school door opens again. I usually get an A in math. It seems as if the teacher doesn't like that. That's why I better make some mistakes, sometimes.