Not being able to be happy anymore

Hii I'm an 11 year old female (12 in a few days) and I'm obviously in middle school. Kids don't know how to not be assholes Even when I ask them "please chew quietly" sometimes it works and I can write a few words down or solve an equation then it's on again. I've told a few of my teachers about this but my second block teacher puts me near kids who smack on gum. I've learned to stop asking bc A: my family has gotten mad at me for asking (as well as family dinners every night with people who stick out their lips), and B: people just don't learn. My earplugs don't work distracting myself doesn't work and I've had panic attacks on the daily, I feel like any day I'm going to lose it and all I want is a happy birthday. It hurts plugging my ears to the point of drawing blood, as well as being called crazy because no one else hears it. If anyone has any coping mechanisms that could work thank you it'll mean so so so much to me, since nothing else has worked.