Hydrogen is the most abundant element in nature.
True
What do you think constitutes most of the universe? Water? Oxygen?
That maybe true for our planet, but in outer space there are mostly stars and not much else. Our sun is one of those stars.
And stars mostly have hydrogen. And some helium with a little bit of other things. But mostly hydrogen.
Hydrogen forms 75% of the entire universe with helium taking the second place.