You procrastinate because you have an unpleasant task that is not internally motivated. A part of you hopes it will go away, so you delay starting. Only when time is running out do you realize you need to get on it. The trick is to find something you would do on your own time.
IMO, a hobby merely helps you spend the time you would have wasted procrastinating.
You are at a golden age where you can choose any path. Don't procrastinate on that. One day you will have to spend all your waking hours working to pay the bills, and changing course then will be doubly hard.
Though, by all means find a hobby, because that teaches you more about what you'd like to do.
