I believe I've came to this statement from one of Korean, Japanese writer, Yu Miri's essay on her childhood. She mentioned that a lot of one's personality is influenced by its first three years of experience where you, have no clear memory of them. In that sense, parents have 'god' like influence on you shaping yourself. Since then, whenever I discover certain sides of myself (the ones that I don't like), I did wonder about my first three years and my parents.
The author of the book is well-known psychologist in Korea- I know her from one TV shows dealing with troubled children and her providing counsel to the family. The book reads like the extension of her counsels to people who are no longer child but still holding onto the trouble child inside of them.
Typically I don't like reading books claiming for 'healing' and I would have considered this one as one of such books. But found her repeated massage lingering with me- she tells the reader again and again it's ok to embrace yourself as you are - sides that you approve and also the sides you don't. Just accept and embrace them. Yes, there may be still a troubled child lurking behind the one who may have been shaped by well-meaning but limited parents, but that's not all you.
Thought her last advice- instead of trying to fix what you don't like about yourself, try to learn it better (how your emotion and minds work) forgiving and practical.
Would love to go back to the book and read bits again.