Maturity always seemed to me like a loaded concept used by those with more social power to make you conform to what they consider "normal behaviour"....
Without wanting to blame you, I was confused that you asked about "understanding Si and Fi"; it should have tipped me off. You've been trying to use...
I'm not sure what your question is, but let me ramble a bit, and maybe this will make things a bit clearer. I'm assuming you mean Si/Fi when talking...