Easy like a fifty foot fall.
Well it's more that "Not everything matters." But you certainly do.
I realize that now. There was a time, however - a long time - during which I truly believed that I had no worth. That time ended when I began to formally study the sciences.
I'd say, it's more like EVERYONE matters...and I can think of lots of THINGS that don't really matter at all.
Everything includes everyone. I am referring to the interconnected nature of all things, not necessarily "things" as material objects.
While it's true that everything matters, how much it matters to you is another matter entirely.
It matters to me very much. All of it. Indeed, this is why it is ruinous.