It sucks. There is the clinical kind depression and the environmental kind of depression.
They both suck.
I'd elaborate more but I'd come to the same conclusion.
Let's just say that when you hear some person tell someone to snap out of being depressed understand that human does not have a clue of what he or she is saying.
Some times you get lost. You have to find your way out. That takes time. Or medication. Or an inspirational word, song or movie.
There is no one way out. There is no snapping.
We are not light fixtures.
We are human.