You do mean something. That's why we're here, and that's why we're reading this. Please don't think about anything of that sort. There are many reasons why we're here. People need you. You have a purpose, and that's why you're here. You can even see chocolate as the reason to live! Anything can be a reason. No matter how little or small, you're here because you need to be. :)
I'm not sure what you're going through, but pain is needed to grow. You can do this. Believe in yourself. I'm sure those that watch you from above will be more than willing to guide you along the way.
Please be strong, don't give up!

Just hold on dear !!
Everything's gonna be alright , kay !!

You're asking for reason???
The reason is "YOU"
live for yourself !! ^_^
I've gone through what you just wrote above..
but i'm sill alive and i'm glad.
I really am !!^^

You are born because God gave you as a blessing to your family.
You wake up everyday because God want you to do something.
You feel the pain because God know you can handle it as you are strong.
So why are you still alive?
Because GOD LOVES YOU!