I think.... become mature is to actually just accept some kind of "have to" ; and get into life as a whole, really live and feel as expected seems to be ... suppressing, suppressing of something that will never actually change in the way we feel, and will eventually come back as we grow old, and start to get (or be put) out of the life that we accepted as absolute.
LEAVE BEHIND THE IMMATURE DESIRES IS THE GREATEST LIE WE CAN ACHIEVE. ~_^