Failure

Questioning the reasons of my existance

I'm a failure at this thing called life.
I don't even know why I try to any more.
Too many times I've taken the wrong path,
and been guided away from His open door.
How can I convince others life's worth living,
when inside I feel like I've already died long ago?
Is this my purpose, the reason put in this world,
to teach others a lesson on how not to live life?
Because if it is, no one has been listening to me,
and I'm ready to give up on this losing battle.