You are made of elements, along with everything else on Earth. You’re mostly oxygen, carbon, hydrogen, and nitrogen.
However, on all of Earth, it’s a bit different. Oxygen is still #1, followed by silicon, aluminum, and iron.
Let’s be more extreme, and think bigger: in the cosmos, it looks very different. Hydrogen is by far the most abundant element, followed by helium. Everything else is only a very tiny fraction.
Remember: Life is part of the Earth, and the Earth is part of the universe. Carbon, for example, is very concentrated in living things on Earth, but is (in the grand scheme of things) a very rare thing.