I know that sometimes we just get sad. It's called depression. You may not be diagnosed, but it certainly is an emotion. Everyone should be able to be told this everyday, so if you haven't, you're beautiful, smart, and you have it in you. Stay strong.
Depression in more than just an emotion. It's a condition that no one should have to face. It is far worse than just sadness. So many people now a-days self diagnose with conditions they have no clue about.