Growing up is doing the things you don't want to do, when you don't want to do them. Most of us walk that path at some point in our lives. Many, maybe most, walk it throughout their working life.
Some poor souls hate their jobs, their home life and points in between. But they keep the same job and return to the same home day after day, year after year. I feel badly for them. We all need to grow up - to accept and shoulder responsibilities. But if you don't like what you do; you inevitably don't like who you've become.
We need to play. There's a reason schools have recess. If we don't, we start doing stuff like drinking too much to "unwind." Or having to take Valium or Prozac or somesuch to get through the day. Or even dunking someone's pigtails in the inkwells. (I just heard a collective "Huh?" from everyone born after 1956. Crap - that's most of the world now.)
Playing is healthier. Either real physical play like sports/exercise or just being a goof now and again. Both are good for you.
The above is my explanation for why I've been goofing off and not writing much and I'm sticking to it.