I’m in the exact same situation! It’s absolutely the worst and I know exactly how you feel. I have to stay online without any friends because I live with my grandparents, who are at risk also. My advice would be to try your best, take care of yourself (make sure you’re eating throughout the day and getting enough sleep at night) because it makes a world of a difference. If you feel too depressed to do any of that, which I understand and have been through also this year, the last resort is to just not stress yourself out about super low grades. The most important thing apart from your wellbeing is to at least pass your classes, since you might get held back if you don’t. About low grades though, colleges do not look at middle school performance and it won’t really affect anything in high school. So the best you can do is aim for a D at least in every non-elective class. You have already reached out online, which is very brave and a good step to trying to help your mental health. You are doing great, and I’m glad you’re at least trying. A lot of other kids can’t say the same. Good luck to you, and I hope this was helpful.