Mostly.
All that carbon, oxygen, nitrogen, etc — that was all made in stars. Most of your body is made of that stuff: atoms that a star forged inside itself or at the moment of its unimaginably violent death.
Hydrogen.
Never part of a star at all.
Most of your atoms have been in the Universe for 13.8 billion years.
Most of your atoms were forged in the Big Bang itself.
But I think it’s MUCH cooler that most of our atoms have been in the cosmos all along.