I remember the days when I worked full time. Structure, not always feeling guilty because I should have been studying. I'm back at University now, and not only do I not exercise, I'm a writer so I sit on my arse for hours and hours and hours, procrastinating, telling myself I'm going to start working any second now, until finally, between 10pm-1am I get a sudden burst of energy and in 20 minutes type out 1000 words.
If I could just do that at the START of the day, then I'd have the rest of the day doing other stuff, like going to the gym.
So yeah, I feel you when talking about your difficulties during university, and I hope when you settle into the real world it all starts falling into place.
Be warned, especially at the beginning, you'll probably be too exhausted after work to cook, but you'll get used to the long work hours. Good luck!