What should I do if I am laughed at and bullied in a technical school? Please look at the problem description and thank you again!

I have to say that instructors have great responsibilities. Secondly, your introversion is also part of it. If you want to change this situation, feel free to contact the counselor to explain the situation, explain all your concerns clearly, and if possible, propose changing classes or explain to your family about changing schools. Second, force yourself out of that step, learn to let go, and tell them clearly that they don't like those nicknames and jokes, which has already hurt you (which also explains why they will speak ill of him with others). If they still don't care, you can call them Taijun, Bagaya Deer and Flower Girl in a joking tone. They can afford these jokes, so you don't have to worry for long. If you can't stand such jokes, you don't have to worry. I hope it helps you.