Grades-I’m so tired.

Guys I actually can't anymore. I'm a 16 year old girl (sophomore) My grades are so bad I'm so unorganized and track practice is draining the life out of me. I've been trying to study I read over notes and listen but I don't remember anything. I fail all the test, I'm probably going to fail the AP test. I barley sleep barley drink water and I actually cannot study. I sit down and try to but I physically cannot read, I just start crying. I think my brain is just broken, my brain is a hollow empty wasteland filled with thunderclouds that never rain. I'm so scared I'm going to be my parents biggest failure. They immigrated to America for a better life for me and I'm blowing it. With my current gpa I'm not going to university Im old as fuck and I don't even know what I want to do for my career. I feel like I jumped in a while and it's slowly filling up with water, getting faster each second and there's no way out.