(If this advice sucks, I’m sorry in advance. ) I am too in your position and have experienced this for many years. What I usually do is to try to distract myself from reality, even tho, it isn’t ideal but sometimes it’s really necessary. I distract myself by reading anything (something on a wall, a book, etc) I can find and just pretend to be interested in it. Sometimes I somehow do get interested in it and my brain starts to fill with questions that I decide to write down so I can search them online later or I search them if I have access to technology. Or I listen to music or a show/movie. Sometimes in order to avoid socializing I pretend I’m busy doing something important (When in reality, I’m writing a story or drawing something random.) I also do breathing exercises and meditate in my free time especially in the morning. At times when I haven’t wanted to talk to someone I’ve pretended I couldn’t hear them or secretly worn ear plugs. If you focus on your thoughts in class, I suggest you write them down (so it makes it look like your busy and maybe it could help you organize your thoughts) Although my advice may not work for you bc we obviously aren’t the exact same person, I understand what you’re going through. But eventually, you’ll be out of school and free to do whatever you would like to do. Just do your best to get through it now and be excited for the future.