We think things matter because it is a prerequisite of living as an animal. Breathing matters. Feeding matters. To think that these things matter is very useful to an animal. The habit of mind can become all-encompassing, leading one to believe that even little things matter, such as a parking space that one has grown accustomed to or a brand of candy carried by the grocery store. We forget the ultimate reality, which is that nothing matters.
On this planet, there are people now. They were not there in the past. They will not be there in the future. No record will be preserved of their existence. This is a simple concept, but difficult to accept. The Universe does not play favorites.