The universe is mostly not matter. It's about 63% dark energy. What little matter there is is mostly dark matter. Only about 20% of all matter is not dark matter.

Of that 20% of matter that's not dark matter, it's mostly Hydrogen. Hydrogen makes up about 80% of all non-dark matter in the universe. The remaining 20% is mostly Helium, which makes up about 19.8% of that 20%.

So that means that everything else, all carbon, all iron, all oxygen, and nitrogen, everything that we are made of and everything that out planet is made of (excepting the hydrogen in things like water) is made of a vanishingly small and rare subset of what's available in the universe.

95% of the universe is dark matter and dark energy. Of the 5% that's left 4% is hydrogen, and Helium takes up most of the remaining 1%. We and our entire planet (excepting the Hydrogen bound up in water and other minerals) are made of less than 0.001% of the universe.

The Calcium in your bones, the Iron in your blood, the Carbon in your food, the Oxygen that you breath, even the ground that you walk upon, all of it is so rare as to be almost impossible.