I may be 32, but I can throw in my own thoughts here. Stop paying attention to "societal norms". Societal norms are just there to control people. Do what you love. Watch cartoons and listen to whatever music you want to. You don't have to be an adult at all times. Take a break once in a while.
Considering the vast majority of people that walk around naked in the public locker room without an ounce of shame are people over 50 or over 60, I find this comment has got it backwards. There seems to be a universal constant that the older you get, the less you care about what other people think. I know I have experienced this myself, and most older people I ask tend to agree vehemently. It also explains why so many young people are embarrassed by their parents.
My advice to teens and people in their early twenties: don't worry what other people think of you. No one else is thinking about you much at all.