On the journey to becoming a productive member of society I had to compartmentalize my inner child.
During my early schoolboy years, he waited patiently for the school day to finish so that he could finally resume his creative and playful pursuits.
As the education became more involved, he had to wait a little longer because of homework.
In university, the complicated assignments, group projects, and late night study sessions meant that he would often not get to let loose until the weekend.
The full-time job, commute, technical projects, work politics, and other adult responsibilities really did the biggest number on him though. Sometimes he would go without playing for weeks, or months at a time.
Today it's as if my adult mask has adhered permanently to my face and I can no longer access him at all.
Mixed feelings here, what is an "inner child?" Feelings of exercising creativity and spontnuity don't have to be "compartmentalized"… Just work that into your adult life. only thing that is different otherwise is obviously responsibility, that will never go away. You might have to answer to your wife as to why you chose to spend a whole Saturday watching cartoons, but as long as you make your needs known, that shouldn't be an issue as well.
I'm sensing you have problems communicating your desires(ideas, inspirations, etc) … other than that, you might be feeling nostalgia. But nostalgia is mostly ignorance. It felt like good times at times because I was ignorant to how my parents struggled.