I've pursued dreams and achieved them, but I don't think anybody should think their life is incomplete if they don't follow some dream. Happiness doesn't come from achievements, or money, or any sort of treasure. Happiness is a frame of mind, not a destination. It's appreciating what you've got and building relationships with those around you.
At any given moment, your circumstances can change. You may not be where you want to be right now. You may not even be doing what you prefer to do. But, if you change your way of thinking and realize that you have all the opportunities available to you just like each one of us. You can begin to focus on what you want to achieve and make it happen