Jealousy
Jealousy is one of the most screwed up emotions in the world. It's like when you see someone else is better than you in certain things and you feel bad about yourself not to be able to achieve such milestones. It might be a good way to motivate you to work harder.
But there are times when no matter how hard you work, there are things that are fated in a way beyond your reach. And to make the situation worse, you'd actually feel the agony of being left behind, seeing others happily and somehow trying to make yourself look 'nice' by acting cool about it. It's the worst feeling ever ......
Screw life, when you're left behind, and the thing that you are chasing for is one of your top priorities in life...
Have you ever want something so so so so badly and yet you know you couldn't have it ?
Envy is indeed one of the sins of mankind ..
I need to go running