Life isn't a party. If you decide decide you aren't vibing with the party you're at, you can go home and cuddle all your plushies, and say hello to all your friends in the next party you're invited to. Once you're dead, that's it. There's no home for you to go to and you can't come back.
There are so many things you can do if you hate your life. You can move to another town, change your name, and build another one. You can find some people your age who get you and struggle through it together. You can take your suffering and scream it from the rooftops and be heard. But if you make an impulsive decision when you're at a low point that if you'd lived you'd come to regret...