True maturity is realizing that it's not inherently a personal moral failure or sign of low intelligence to make mistakes,experience negative emotions,or have moments where everything becomes too much to bare,and you either shutdown,have a breakdown,or have a breakdown,then shut down,or make bad decisions.
It's a normal,natural part of life to experience bad things,and make mistakes. To have accidents. To think bad thoughts,sometimes. To feel shame,guilt,etc etc.
You are not lesser for that. Even smart people are human too,we are not perfect. We are oftentimes just as capable of doing "weird",or "gross",or "embarrassing" or "bad" things as anybody else is.
Even smart people can go through life experiencing raw,messy,difficult,demeaning things,too.
It is also a sign of true maturity to accept that growing older,or taking on a role of great responsibility and/or authority,does not mean you must give up all of your whimsy,or playtime,or your imagination and joy.
Most humans need playtime,they need enrichment,they need social grooming and other forms of bonding and positive stimuli. They need to create,to imagine,to explore. To learn.
To grow on their own terms.
They need colors,scents,textures,sights,smells,other sensations. They need excitement and rest. They need fantasy,and healthy escapism.
They need comfort,and positive nostalgia.
They need soothing softness and rough,messy,unfiltured,unregulated,raw,natural playtime just the same.