I’m so drained..

I’m a high school student and honestly I feel so drained lately... my teachers give tons of work with impossible due dates. I’ve been gaining weight recently and I’m already overweight and I just feel lonely because everyone is getting a relationship and well I’m not lol. I feel dumb writing about this but I’m normally just the funny friend/sibling so this really isn’t something I can talk to my friends or family about. I come home around 3 pm and can sleep til like 5 am when I have to go to school again, I don’t know what to do and I just feel sad and lonely all the time...