Being a professional photographer is about more than just excelling at creating imagery; in fact, that's often only a small part of what goes into being successful. This great video talks about exactly the kind of mindset you need to have to make it as a professional photographer.
Coming to you from Jeff Rojas, this helpful video lays down some cold facts about the mindset you need as a professional photographer. I think it's easy to romanticize the idea of a career as a creative of any sort, when in all reality, the most romantic version is probably the passionate amateur, as the burdens of running your own business and trying to reconcile your artistic impulses with the need to have a steady income never exist or mix with each other. In addition to the great points Rojas makes, I think it's also important to always be honest and objective and your own abilities. It's crucial to know if you're ready to make the jump and once you have, to know any areas you need to shore up or perhaps begin learning. Having a close photographer buddy or two whose opinions you trust can make a large difference in this; just be sure (as Rojas alludes to) that they're people who will give you honest feedback, not just validation.
Lead image from Rawpixel, used under Creative Commons.