The answer is that it's all conceptual. There is no real, objective scale to the universe, you're picking a reference point which can feed the monster inside yo

The answer is that it's all conceptual. There is no real, objective scale to the universe, you're picking a reference point which can feed the monster inside you called depression. It's just as valid to pick a different scale and focus on that. I say that like it's easy, but it's not, it's a struggle, but being aware of it is the first step. It's about where you direct your attention, and how you react to what your attention is focused on. Negativity breeds more negativity, and to break this cycle you must find ways to reverse its polarity. To me that is creative endeavors, which are like dropping a bottled message in the ocean of time hoping that someone in a distant future, in a world I wouldn't recognize, might pick it up and gain something from it. I have that hope because I know I've had that happen to me from people long dead before I was born. As for reading material, I'd actually recommend Watchmen, the character arc of Dr. Manhattan is pretty much centered around this issue.