Well a bunch of users have given great advice so I'm pretty sure whatever I say will be exactly on the level of what they say. I've delt with issues that I had no idea what they were for years now. I would never be able to be truly happy and I would overthink everything, then that overthinking would become reality to me. I would think of completely stupid stuff and would believe it until somebody told me otherwise. Over the years I lost some friends, I lost relationships, I was always distracted, and I never knew why. I have it pretty good, I have a bunch of caring friends and family, nothing that ridiculously hard. Recently I found out the cause is most likely that I have some form of Anxiety disorder.
What I want to get at though, is that all these problems. They are going to go away. It might take awhile, yeah, but it won't take forever. I've been through some stuff i thought I would never recover from and today it is just a faint memory in the past. I've lived dealing with this anxiety stuff for years and years of my life and I can still go out and have a good time because I know nothing that bothers me will last forever.
Your classmates are a bunch of little stuffs. But you know what? forget them, because In a few years time they won't even matter. You will look back on this awhile from now and realize it meant nothing, just a speedbump in growing up. If their is one thing I've learned, it is that you never know what the future holds. I've been through things I thought could never happen, good and bad. Who knows, maybe in a few weeks your life will change immediately for the better. And it will get better.
Another piece of advice I have is find somebody you can trust and talk to them about it. It is so much worse when you have to bottle everything up. Message your friend, talk to your parents, call a hotline, I don't care who. But talk to somebody. I promise that will make it better.
And honestly if you can't find anybody to vent to and want advice, message me and I will talk to you. I went through rough patches to, and i was always thinking I'd be bothering people venting to them. I know what it is like to feel alone and feel like you have nobody to talk to. Sitting at home at night just overthinking everything until it shuts you down. It is a terrible feeling and I don't want anybody to ever go through that.