When it comes to sadness, let yourself cry. Lock yourself in your room and let no one hear you. You only get a day.
When you've finally worn your heart out to a state of excruciating numbness, Stop.
stop. *******. crying.
Now act like your heart is only used for pumping blood. It demands to be felt. Ignore it.
Act like a *****. Act as though nothing gets to you. Sardonic smiles are your armour. Sarcastic replies are your weapon. Wield it without care. Wield it as thought you don't give a **** about who you hurt. You care too much, and that is your flaw. Flaws were meant to be hidden.