An embarrassment thing

this thing also happened in my high school. My teacher was so strict! She couldn't allow us to waste time for studying. At that time, I really like singing with friends, I am not lucky! When I sing song to my friends in classroom, teacher saw it. Then she criticized me in the classroom, and all the classmates just pay attention to me! I just want to find place where I can hide. I remember my face felt so hot!