Entering a new class, I feel inexplicably depressed. What happened? How to do it well?

A new class and a new environment need you to adapt. It's normal not to get used to it at first. No one can always be in the same class as someone who has a good relationship with him. If it's not good, it's not in the same class. Just relax. You don't have to pretend to like someone you don't like. Just let nature take its course. If you don't like them, don't provoke them, but don't let them bully you. That's all. Study is your own, your mood is your own, don't take irrelevant people to heart, they are not worth it. As for the classroom, it's hard to say. You can go out for a walk after class and find a place where you think feng shui is good. Hehe, find a mysterious nest yourself! ~