You were an infant who didn't know anything and couldn't physically take care of or economically support yourself before "all of the cultural conditioning". This quote is pop psychology nonsense. You are your experiences, and how those experiences interact with your genetic predispositions towards certain personality traits. There is no more authentic past self to find, because every experience you have is part of the authentic you who exists right now.

The best you can hope for is to find a you that you can better live with, whether that involves unlearning something or learning a whole new set of things will vary from person to person. And that's a process that we're all going through all of the time anyway. All you can do is be mindful of process so that you can actively move towards things that seem to help you do that and away from things that don't.