Why so blue?

Sadness

I'm the creeping feeling you get from an action, or just out of no where. I am easily gained, but hard to shake off. I'm around every corner, and my color is blue. I'm the reason why you're sobbing quietly while curled up alone, and I'm the reason why you'll have a frown as a resting face. I'm the thing that tugs on your heartstrings, the thing that causes the lump in your throat, the thing making your voice crack, all while seeing something you don't like. I'm the thing that can break you even when you're at your highest.