Once you get past the existebce question and quagmire the question becomes if humans are capapble of compete freedom of choice or if we are just a complex system that is responding to inputs.
I believe in the Hindu tradition Atman is the 'you' that creates. The question of mind and self has been covered for over a thousand years in Buddhism and Hinduism, more as a psychology than a religion.
When you say 'I' what do you mean?
https://en.wikipedia.org/wiki/Ātman_(Hinduism)
Ātman (/ˈɑːtmən/) is a Sanskrit word that means inner self or soul.[1][2][3] In Hindu philosophy, especially in the Vedanta school of Hinduism, Ātman is the first principle,[4] the true self of an individual beyond identification with phenomena, the essence of an individual. In order to attain liberation (moksha), a human being must acquire self-knowledge (atma jnana), which is to realize that one's true self (Ātman) is identical with the transcendent self Brahman.[2][5]
The six orthodox schools of Hinduism believe that there is Ātman (soul, self) in every being. This is a major point of difference with the Buddhist doctrine of Anatta which holds that there is no unchanging soul or self