Prioritizing all the tasks of your day prepares you mentally and makes it easier to divide your time according to the importance of the task. It also helps you to keep a track of your progress anytime during the day and makes it less likely for you to miss something important and get worried afterward.
You live only once and this is your one and only chance to do what you really want to do. You can live in fear and continue to lead a life of mediocrity or you can learn to let go of secure paths and choose the kind of life you were born to live. The choice is yours!