Why do I bother?

So I try once again, before i give up and give in.
There's really not much else i can do..
So i ask myself why, as i continue to cry...
But i know that i don't have a clue.
So i climb into bed and i cover my head,
because the voices are loud in my brain.
And it's just so much to bear, as i lie alone there,
and my tears fall steady like rain.
In my mind i keep thinking,
of how low i've been sinking...
With all these thoughts in my head running loose ...
The rejection does sting but I can't do anything.  
I know in my heart it's no use.