Anathema
Crotchety Olde Man
This idea that life is some sort of endurance test to see how much misery you can take is ridiculous.
I take it you believe there is no afterlife. I respect that but personally disagree. I believe life us a test of the Soul to determine its worthiness to move on to something better, or worse, or try again.
Life is exactly what you make it. If you are miserable, you did that to yourself. If you cannot find joy in each day, you have wasted the life and love you could have.
My misery is partially self-inflicted, partially Fate and partially induced by the people and society I was born into. We could argue the percentages on the blame poe, but that would be largely pointless.