Have you discussed this with your parents or another trusted adult, perhaps at school? Starting high school can be daunting. My daughter always seeks out a teacher or counselor that she knows she can check in with at any time; to calm down, to share feelings, to get unbiased attention, etc. She also finds that exercise helps her overall. Right now she is taking extra walks with our dogs or using the treadmill at home to keep her body moving in a productive way. She says it helps clear her head. I hope things get better for you!