Now, I'm not telling you not to kill yourself. By all means, this life is fucking miserable. But I've seen a few edgy kids here and heard them in real life, talking about slitting their wrists. Sure, it's briefly and sharply painful but your pain will end when you bleed out. However, think about what happens if you survive and someone saves you. I just split my fucking finger open, nearly cut it off in a machine today. I only had some stitches put into my finger, and it was an unholy hell of pain the likes of which you never want to experience. It didn't matter how much the doc stuck me with (Lidocaine, I think). The pain didn't numb. Shoving that needle through the meat of my finger was insufferable. Now imagine them shoving a sharp needle through the meat of your wrists numerous times.
Choose gas if life's an ass.
Choose a gun if you're done.
Just don't slit and get knit.