What am I doing wrong?

Currently, I try to seem like a happier person, always joking, making jokes, but I'm always feeling the same emptiness, it's always the same thing, every day the same routine, thinking too much, sometimes, It's not even worth going through so much work just to have a beautiful coffin when you die, everyone will be sad and in the end they'll forget you, the famous overcoming, in reality, I'm fucking tired, I wanted to understand the reason for so much happiness in the midst of so much chaos.

(A teenager's Vent)