Hi just want you to know there are a lot of caring people on here to give you advice. I'm not the best at it and I don't know about you but since you posted in the depression forum I'm wondering if you have a counselor at your school to talk to and if you have tried medication for depression.
You are not alone here. Have you tried the school and study issues forum? best wishes hang in there you will get help here from othrrs who are having similar problems!