Pain.

It's far worse than misery when you have to swallow that you're the worst part of someone's life for a a specific time (long period of time, short period of time, or simply always). I mean, it's someone's life! Someone's beautiful life, right?

Why can't things fall together they way my "heart" sees things? Why can't I not mess up and keep everyone happy? Where is God when I need Him? Why did I do that when I knew it could look foolish to someone that doesn't understand? Why do things have to get ugly before they're lovely?
I guess 'my' answer to all of those types of questions would be: Why can't we realize that people have been asking those similar questions since the beginning of time? (It's needed, clearly) Why can't we just "be there" for the ones dealing with "their" pain in "their" moment? You can train your entire life to not be selfish, but caring, and not cause pain, but when you do cause pain..learn from it.

It's clear, obvious, and a fact that pain will find you, grab you and stand in front of you and stare into your eyes with so much passion that you'll cry. You'll feel like a piece of shit buried under more pieces of shit. You'll feel your idea of hell inside of your stomach, crawling out of your mouth. A lot of us try to avoid pain, which is probably why things are so painful.
What's worse that pain alone? When someone tries to compare their pain to yours and then makes bias and out of their zone comments on "your" situation. Where did this "getting the upper-hand from pain" come from?
"There's no way he/she can be going through as much pain as I did. I mean, mine lasted longer, I hurt more people, I ruined more hope, and I was hurt for longer. " (I, I, I, Me, Me, Me) Those thoughts are small reasons why we'll always have intense pain. (But that's a good thing, I suppose)

Realizing that pain, and the intensity of it, will be something only you know (not compared with anyone else) and it will come and it won't make sense, but it will help you understand and embrace the grace that comes with pain.