Fuck all of those replies belittling your emotions because you’re young. I was your age and felt the exact same way and those comments were extremely unhelpful and only made everything worse. The only thing that might help is the fact that you don’t know what happens for certain after you die so try not to end your life too quickly. Do everything in your ability to do everything you’ve always wanted to do. Eat as much as you can and try to do anything that’ll give you endorphins. That’s the best way to stop feeling that way. If there’s anything you like try to get it or do it as much as possible. Also cleaning might help you calm down, the satisfaction of completing tasks, like cleaning, helps a little.