How the Hell Do You Exist?

There is a causal in the world. Everything that exists to day exists because of things that happen in the past. If you go back in time, you end up killing your own grandfather. Then how is it that you exist? That cause is that that breaks causality. So who came up with relativity? It was albert einstein. He published the special theory in 19 zero five and the general theory of relativity in 19 15. But i learnt it from him, but he learnet it from me.