When I was writing questions in class, the teacher walked to the side and kept clearing his throat, but it felt like he was laughing at me, not just once or twice. What should I do?

I think this is the reason in your own mind. It is because you feel unconfident and think that what you wrote is wrong and outrageous. Then when the teacher stands next to you, you will feel that the teacher is making a joke. You, you feel very embarrassed. I think you should improve your confidence so that you won’t feel this way. It is impossible for a teacher to laugh at a serious student.