Everybody is entitled to their own opinion, that's what I always say. This one is yours. Very angst ridden, yknow, this can be used as a very good lyrics to a death metal or blues song. Anyways, like I said, very good :)
P.S. I would really like to read some of your poems having a totally opposite perspective, or polarity or whatever. Indubitably, they're as good as this :)

Here are my suggestions on this piece.

Life hates me
Life doesn't care.

It holds me in a prison of hate
without light nor joy,
only guilt and lies fill the air.

I can't break free
Its hurting, I'm falling.

Darkness surrounds my thoughts.
I'm lost in memories
My fault, my mistake.

Life is cruel.
Life is nothing.

it may seem like life is nothing, but I'm sure that there have to be at least one little thing that proves that life is something. I hope you can find it.