Depression.

Symptoms:
*Feeling suicidal
*Cutting/self harm
*Never happy. Even about the most amazing things
*Feeling like not talking to anyone
*Not trying at anything
*Thinking you're worthless 24/7
*Ignoring texts, even from Him/ Her

Depression is not:
*Sad because a guy rejected you
*Busy
*Having a lot of homework
*Little drama

And it's absolutely not an excuse for messing up and making bad mistakes.

I had depression for 9 months straight. It's not something to use as an excuse or just to make jokes about.