I'm so sorry to hear what you're going through!
I can totally relate and I know it's been long since you posted this here but just want to say, I hope things got better? If it hasn't, I have a few suggestions.
I've went through the same but I stood up, walked up to my classmates with my own feet. I didn't wait for anyone to come to me. This helped gradually and people were more open and friendly. You just need to take that step yourself and talk to them! If that doesn't work, let me know, we can work things out together
Whenever you're feeling down or depressed, I suggest you talk to someone whether it's a teacher or your mum or dad. I understand it's hard and sometimes, nothing anyone says actually helps but at least talking to someone about how you're feeling helps you a lot!
Good luck xx