How does one know their own personal growth?

I've been reflecting to myself a lot recently (i always self-reflect, but these times more than usual.) I've always been curious to know "who I am, what i am, and where i am" in life. But, the more I learn, it feels like I didnt just learn it, but I had always knew it. I only realized something I seem to have know all along but didn't know i know before. (I hope you get what im saying) Why is that?

Better yet, what is "personal growth" defined as?

Personal coaching