That's the danger of the power of NOW.. right now, the pain of regret is a long way off and to some extent, irrelevant.
The key to all this is Vision, Inspiration and Purpose (VIP) because while you have a vision, and an inspiration and a purpose greater than yourself, the pain of regret is already with you right now, in this moment and it's far higher than the pain of discipline.
Put it another way. If I have my vision in all seven areas of life and those visions are inspiring, and I have a purpose greater than myself, then forgoing something in the short term causes me some pain but the pleasure is automatically there for the long term. Pleasure and pain, balancing each other, as they must in life.