Why am I so stupid? When answering questions and doing problems in class, I always fail to do well, and people always laugh at me.

You are not stupid! But you are not confident enough! Judging from your problems, your personality is too introverted. First of all, you need sunshine, learn to be confident, and communicate and learn more with outgoing and lively classmates! Then study hard, listen carefully, do the questions correctly, try to answer some short questions in class, and be sure to get correct answers, so as to get praise and affirmation from teachers and enhance your confidence! Don't be afraid of jokes! Failure is the mother of success! ?