I agree with this big time. Not that I didn't have hobbies, interests, desire to contribute to the world from the beginning. But after a while for me it shifted from "I have all this time and I would like to have productive hobbies where I make things and contribute to the world," to "oh my god I really have to WORK if those hobbies are ever going to turn into anything worthwhile and oh look I'm taking on more responsibility at work and now there are so many more days when I come home tired..." Life changes really quickly.