Why does we exist? Because we are, that would be the reason why you are questioning, there is a ending of universe, but does it actually have a beginning? We do not know what we can't observe, humanity "observes" actions according to theories other than present, but is theories really a thing that works, or we simply recognize thing the way we see? But are the theories we rely on right, or in another word, exist?
A normal high school student, with acnes. 17 years old when I write the book.