Why? Just why?

I have always been so fascinated about life. Not just humans, literally everything on earth and earth itself. I would consider myself very spiritual, not very religious. But the more I study and research everything, the more confused I become. Earth is literally less than a grain of sand in the universe and yet we all have a consciousness here. We go to school, get jobs/careers and make something out of whatever this is. With how large the universe is, I would like to ask what others think. What are we doing here? Why are we here?