A life of regret is no life at all. Sure, we all have regrets for things we've done, mistakes made and opportunities lost. But if we make a conscious decision every day to minimize those regrets, we will lead a happier more fulfilling life. And hopefully those around us will as well.
Personal fulfillment is the continual journey of self-discovery and contentment with your position in life. It’s about achieving goals that matter most to you, instead of conforming to social expectations. When you feel like you are moving forward in life and heading towards your lifelong dream or goals, you experience fulfillment.
Happiness is a fleeting feeling that comes and goes but cannot last, as life will inevitably lead to other incompatible feelings such as uneasiness, fear, anger etc.