Depression is encountered by a lot of people. Creators may have a special relationship with it, and it doesn't have to be a bad thing.
A single altering choice may be what brings about an entire story. Fiction, as well as real life, is dependent on these single moments.
All of us need to practice gratitude. Even characters need a moment of thanksgiving or recognition to complete a story and arc progression.
What makes a story is the ability it has to relate to the reader. The power you get from a story is how you are able to relate it to yourself.
Grown up is an undefined state, which heavily involves life goals and dreams. Growing at different paces, we are all trying to grow up to be something.