Don't set resolutions. Get clear on your values. Set dreams. Follow them and never give up. Fail once. Fail again. Fail some more. It's scary. But extraordinary is called extraordinary because it's a life outside of the ordinary. It requires going that "extra" mile that most people don't bother taking because of reasons I won't go into here.
You should absolutely strive to better yourself by accomplishing goals. However, you shouldn't force your goals when the time isn't right. New Year's might feel like a great time to take a stand, but you're better served waiting until you're more fully committed -- mentally, physically, and spiritually.
Choose a target that you figure you have a less than 25 percent chance of reaching, and then go for it, playing full out and fearless without any real sense that you "should" be able to get there. Each time I've run the program over the past six years, people surprise themselves (and often me) by getting further faster than they did in pursuit of their more "reasonable" goals and dreams.