2 Timothy 1:9

Who hath saved us, and called us with an holy calling, not according to our works, but according to his own purpose and grace, which was given us in Christ Jesus before the world began (chronos aionios)

‘Chronos aionos’ literally means ‘before times everlasting’ but see the rest of this site for a clearer definition of this term. So, something was given to us (ALL OF US) before the world began, so we must have existed before this time.