I’m not depressed (at the moment, well maybe a little), just feeling philosophical.
Edit: the idea of this came to me because I was pondering why people fight so hard to beat diseases and live a few more years. What are they planning to do? Why exert effort just to be here longer when you don’t have a reason?
Just why?
This is a fun question to ponder, and you’ll get a thousand different answers from a thousand different people.
I think the more important question (and much harder to find an answer for) is What’s the meaning of the universe? Why does the universe exist? How was it created? Why was it created? What was before the universe was created? What comes after the universe?
And you can join those two questions together. Are the two related? Is the universe’s purpose to create life? Is life’s purpose to experience the universe? Would the universe exist if there was not life to experience it?
Things exist outside of our observation, but they aren’t interpreted until we see them.