I want to kill myself

I am a junior and I hate myself the reason why is because IM ALWAYS LATE TO MY FIRST CLASS due to lack of sleep due to doing hw on my bed and nowhere else causing me to fall asleep on my homework causing me to have more sleep due my tiring marathon traning three days a week causing less time to study my advance classes causing mostly failure in some of my class and I just don't know what to do I'm scared and lost because of my tardyness to school EVERY SINGLE DAY CREATING FAILURE ON MY JUNIOR YEAR I'm so mad at myself because I want to do better but no matter how hard I try I can't..