Well, if you don't have a belief, life is pretty bleak. I have beliefs and I believe its true, and I've seen proof on it. Luna, if you can't find proof, it's because you're not looking. Look harder and seek God and you'll find it. Your life could be worse, it's God keeping it from being that way, and He's teaching you a lesson, even if you don't notice. Your life will only get worse if you don't fight depression.
You may not believe God, but at least look into it. Find something to give you purpose. Cutting and suicide is selfish: you're only thinking about yourself and how bad YOUR life is. Why not help others and help their lives? If your view of this isnt selfish, it's because you're thinking of others and how you don't help them: this is selfish in it's own way! how? Because you're not thinking how they will feel when you die, like your family, You may not think your family cares, but they do. Someone does care, like us.
I'm not trying to start a war, or make you feel bad, I'm just trying to find a way to help you. :)
I hope you feel better soon!
(Wowza dis was long.)