Life is shit. Yes, you know life is shit, but you go through it anyway. Because the alternative is... well... there is no alternative.
Either you live a shitty life, or die as a piece of shit. It's all shit. Even your best friend could be a piece of shit who would swipe your shitty snack and claim that he took that shit so that you wouldn't die from eating shitty food.
So you might as well just live with that shit. It's not like you have a choice.
Author's Bullshit: This shit is not one big-ass shit. It's just a bunch of shitty short stories. So read it for shits and giggles whenever you have the time and don't lose your shit over it.