Over the past month, i've been pretty depressed and i've been thinking thoughts pretty much like yours. The human thinks there HAS to be a purpose for everything. Maybe there just isn't a purpose for everything, maybe it's just there for the sake of being there. On that note, what's the point of even wondering about that stuff. There is so much more to the universe, that the human mind can't process. There is stuff we'll never even comprehend. Just an example, the human mind thinks that there has to be a beginning AND and end. So when we think about the universe never stopping, it completely blows our mind. (at least mine)