One of the things that is consistent throughout your life is the need for gainful employment. Well, if you do what you love, you'll never work a day in your life. My mom told me when I was younger that the difference between a job and a career is that a job feels like work. This is true with this quote as well because if you are unhappy in your job it will always be a painful experience. If you find work that harnesses your passions, you are well on your way toward finding fulfillment in your life. You can't look solely to your job to meet all of your expectations, but it helps if this part of your life is positive.
When you love your job you are excited to go to work every day, and it doesn't feel like you're just going there because you need to earn the income. When you find validation and joy in what you do then you are enriching your life. If you have a job that feels like work you can always look for something different You can achieve anything that you want to, and you can find many successful career changes without even going back to school. Pick and direction, head toward it, and you will find a much more fulfilling future.