Why would you even do that.
I mean, everything we do is basically us striving for mindless Hedonism, so why in Gods name would you want to ruin the mindless Hedonism we have already?
I think it's more in a manner of training oneself not to ruin it for everyone else, or something.
If it's about being work-trained and everything, why not look to what you enjoyed most in doing that you have any relative skill in; find a way to apply it to your future self, and work with it, or at least use it in a way to cope with adult life if it doesn't go exactly as planned. Kinda like I do with art. I enjoyed doing art, but making it more like work makes me less interested; an odd solution I use is that I separate my works. I'm not a fan of being professional, so if I need to be, you can identify it as such, but you can tell my other works as me just enjoying myself and going with the flow (half the time, my fun work is better than my professional work, and vice-versa).
Currently, I'm working on some ██████ art over time for ██████, and keeping that within it's professional means, but when I'm doing my own thing, it tends to either look crappy by comparison (see old Bloodfist plans), but more as either a concept being worked on, or some finer works which is just me elaborating on an idea for quite some time (like many of my weapon designs), whether it be used or not (like my other airship design, a bunch of other craft, some machines that hide in plain sight as part of scenery, or weapons which take Swiss Army Knife to 11 which I name the WFAO-Series (Weapons For All Occasions) which can contain up to 11 weapons in the same gun; or a reality-breaking pistol that looks and operates by the rule of cool)).
Of course, art-wise, I'm not a fan of criticism (and being professional), unless it's aimed at professional work and where it needs some improvement (especially if mass-producing or something). However, criticism on my fun personal works, I would tend to take offense towards; it has occurred a few times, and I tend to not have fear getting blood on my sketchbook.
Not to sound hedonistic, but life is meant to be enjoyed; it has taken me some time to finally get the message. my "missed childhood" would be all the times I took life (and comments) too seriously, and have been too nice to a fault. In a sense, developing at least some modest asshole behavior has loosened me up to be a better person, at least for myself to make up for the lost less-serious fun I could've had, and to also understand the oddball behavior people I knew (family included; those nuts) had. I dunno, just find an equilibrium you can work with, and build from that foundation, 'cause, that's the most stable thing I've seen in life these days.
Probably one of the best summaries I've come across has to be:
Choose a job you love, and you will never have to work a day in your life.
---Confucius