Why not focus on developing even greater self-discipline so that you can enjoy a wider range of activities. It seems that you're expressing all- or- nothing thinking. Although we each have a "limited amount of willpower and discipline", we develop greater capacities by challenging ourselves to engage in activities in moderation. If we don't engage to any extent, we are making decisions that are fear-based. Also, "things that matter" can include activities that have value for giving us a sense of pleasure and satisfaction vs. being solely accomplishment based. Just because we feel "temptation" does not mean we have to act upon it. When we feel tempted to do something and resist because it is not a healthy/ meaningful/moral choice for us, we can trust ourselves to be open to more experiences.