I'm tired

It's my senior year in high school. I'm failing all my classes and I have 2 weeks to get it to at least a D. It's not happening. I'm going to fail this year, and I'm going to drop out. My parents know I'm stupid, my teachers know I'm stupid, and I'm never going to actually achieve anything worthwhile. I'm letting everybody down. I want to die.

But I still have dreams. I want to become an artist and a musician, but how can I when I don't know basic math? I want to adopt a child and be a parent, but how can I when I don't know the first thing about being an adult? When I turn 18, I want to get a job and save for an apartment, I want to have a life.

But I'm too stupid to do any of that. I don't think I'll live until my 18th birthday. Maybe I will, but after that, then what? I have horrible health, I can barely get out of bed. I'm truly useless and a burden.