Please don't make this your final stage of life. We make endless mistakes, but feeling awful about it shows you want to be better. Giving yourself the chance to try shows that no you can do better, even by yourself.
Even if you don't believe it, your life deserves many more chances. Are you a total fuck up? Don't give up. Lift yourself up. Are you still there? Then there's still hope. What I'm trying to say is, stay. Find your strength! Stay positive. I BELIEVE IN YOU!
You'll remember that you were about to do it, but you chose the better side. To fight through it. What is better for you, suicide or getting back up?
You don't have to believe me if your reasons are otherwise, but believe me when I say it takes courage. No matter what you are that shows what you can be. And I'd want to save you before you do it.