Do you have some goals that you felt needed to be accomplished "in your youth?" In what way do you see your "not youth" as being different to your youth?
It's interesting (to me) that you felt the first change based on "achievement" (must achieve x before age y) but this change is brought on by "relationshop" - your interaction with others.
Perhaps this reflects a general maturing you are experiencing? A more concrete idea of what is important to you and the ability to better articulate your exact goals?
Typically in "ones youth" you are "finding your place", better understanding yourself and what you want out of life. It sounds like you are doing that well. Trying different things. Seeing what fits.
From there you can get a clearer picture of what you want your life to look like.
Good luck!