I have "known" Him all my life. Somewhere around 13, He woke me up to that little part of scripture that says, "All have sinned and fallen short..." and it was the "All" part that had an impact then. That included me.
It was not until college that I realized "Savior" was combined with "Lord" and I began learning how to take my hands off the steering wheel and let Him drive. Although, in reality, He was already driving. I just "clued in" so to speak.