Welcome to PC!
There can be alot of things going on at once. I would talk to someone though and most schools, as a part of your health fees that you've already paid, offer counseling. Get in touch with them either at health services or it can be a different department. Sometimes it is more difficult at times than others to focus and especially with depression, it's important to get help. You made it this far, talk to someone, the help is there.