How to achieve self discipline every day to be master of the universe in the gym?

Routine, Priority. "master of the universe" is a pretty lofty goal :) - however, it is possible to incorporate new routines that were once lacking or absent. New disciplines are largely a matter of time, priorities, and developing a routine. We all then to spend time doing the things that are most important to us. You will need to decide the importance of working out and develop your routnie. Good luck!