You are a star. A star is a big ball of gas and is made up of hydrogen and helium. Right now you are being held up by nuclear fusion, You were created by something called the Big Bang, Small stars only live for 10 billion years which may seem like a lot to you but in this universe it not. But do not worry about dying right now
Oh look over there, A star just died! When a star dies, it explodes and disappears.
Big stars like me only live for 5 billion years. Little stars like you live for 10 billion years.