I'm 25 and my shirt glows in the dark. A skeleton rock on symbol lights up as the world darkens around me. That's always been me though, never growing up fully, and I would never apologize for that result.
Responsibilities ****. Showing up every day only to do it all again tomorrow can get pretty **** tedious and is constantly boring. But when we find the little things that bring light to the darkness, who are we to turn them away. Of course we can't always have the light because we wouldn't appreciate it nearly as much. Sure, we will have those things that take up space, the things that we have to do in order to live, but that is not our definition. Our dreams perpetually change - we have no definition. Our best bet in this world is to find those things that bring light and hold on to them.
So wear that glow in the dark t-shirt, wear those dinosaur footy pajamas, jump in puddles, watch cartoons, eat sweet cereals, draw horribly, sing innocently, get excited about the little things. Because life isn't one whole big thing - it's made up of millions of smaller pieces - collect the good ones.