No one can be professional if they don't know what they are representing and have no interest in what they are doing...that is what JOBS are for...careers on the other hand, are another story.
a calling requiring specialized knowledge and often long and intensive academic preparation
Being professional from what I have learned as a student, means that one is willing to dedicate time, energy, money, and hard work to sustain what they believe in and what they are doing. If one is unwilling to dedicate any work into a career or a profession, then that is probably not the profession for you at all. You also must be clear and concise about your own goals, and how you is gong to achieve it. If you have no idea what you want, then you need to step our of your comfort zone and explore what you want, only then will you know what your calling is, and will want to dedicate as much as you need to, to accomplish your goal.