One thing that changed since I was a child is how I wake up in the mornings.
When I was younger I woke up with such energy, and thoughts of "today's gonna be such a sunny day! I'll eat something yummy and have fun even if I don't go out! Why would I be sad?" 
Even if I went to sleep with sadness, I thought about a sunny morning, with the sunshine making everything it touched look brighter.

But now when I wake up I just feel numb, I don't feel like it's worth it anymore. Without energy, everything looks gloomy, dreadful, nothing to enjoy anymore. Nothing tasty to eat, no fun to have.