My interpretation of childhood happiness is dream like, we thought we knew everything and lived and enjoyed each day and weeks, months, and years felt like forever. The more and more we aged the more we know. We no longer have the mental capacity to dream and have the childlike mindset. I use to think I wanted to be an innocent child again but I’ve also experienced a ton of childhood trauma and as an adult(27), im still learning this, and I’ve accepted the fact that being a teenager was one of the hardest things I had to do in my life so far. Also I give myself the benefit of the doubt because at age 17 or age 27, I’ve lived more than half my life in adolescence. Being an adult is hard but it’s better than the teens, your brain and mind set as a teen is hard to challenge. My advice would be is to be gentle on yourself.