What should I do? In the dormitory, my classmates asked me to go shirtless together, but I dare not be a little shy and want to refuse.

You can make a choice, agree or try something you have never done. It is not a bad thing for people who are well-behaved. The world is changeable, with more challenges and changes, life will be full of fun. If you are in a bad mood, in a bad state and don't want to do it, you can refuse. It doesn't matter. As long as you are a normal roommate, he will understand and won't force others to do things they don't want to do. Don't worry that refusing will be laughed at or isolated. This little thing is nothing. In the future, we will live together for a long time, and when they need your help, others will not reject another person because of small things.