Nothing.
I've raided at a server first level for 10 years, all while graduating high school and college, maintaining various jobs and somewhere in the middle moving out on my own and paying for my own place.
Now I have a career, a home, a car, and I still raid. Learning to budget your time is easily one of the most important things to learn to do when you're coming in to adulthood. You can absolutely have your cake and eat it too.