Why isn't anyone farting in school?

I was homeschooled previously with a small group of other children and we fart in class all the time.

Now I'm in public school for high school and no one is farting. I was very sheltered and public school is like a whole new world for me, so I don't know what the norms are. I've been holding it in but my stomach hurts and it leaks out anyway.

I don't understand how there are so many more people in high school and yet zero farts...