You sound very troubled. What has happened in your life that has brought you to this point? I seriously doubt it's just the fact that you don't get a lot of replies to your blogs. The world is a big place, and it's easy to get lost.
Even if you don't value your life, someone else does. I really don't know you, but I do know this: I don't want you dead. I have been at this same precipice a few years ago - everything in my life went horribly wrong (I'll spare the details for brevity). I was very, very depressed and really thought that it wouldn't matter if I lived or died.
But a small part of me inside knew that if I gave in, those that would hurt me, that had oppressed me and did me wrong would win - and by my own actions, I give them the satisfaction of my own ultimate failure. So, out of sheer stubbornness and the will NOT to let them win anymore - not to let the world have the last say - I picked myself back up, and over a long period time that included many therapy sessions, long talks with family and the few remaining friends I had, and then community service, I realized that not only did I want to live - but I did make a difference.
We all, as individuals, seem to be small and inconsequential, but in the span of our lives, each act of kindness, mercy and generousity, no matter how small, adds up to affect so many other lives. We all do make a difference, and you have the right to stand up and say "Hey, why the hell should I care what the world thinks? I'm not letting you off that easy but cashing in my own chips - I'm gonna do something about it! I'm going to find a purpose and do something positive in my life! I'm going to make a difference - and instead of waiting around and feeling sorry for myself, I'm going to go after it, because no one has the right to make me feel this bad!"
So, please, take a deep breath, relax a little, and realize that you have the right answer inside you all along - and that is to continue on living and make a difference. Never look back - and never give up!