Are you happy when you wake up in the morning knowing that you are going in to work? Do you feel as if you have hit your peak at your job? Can you honestly say that you love what you do? Some people can not answer these questions positively and if this is you, then you need to decide if the career you are in is right for you.
First off take the time to go over the different things that you like or love to do daily. Do any of those have anything to do with the career you are currently in? Most people pick careers according to what they liked to do either in school or outside of school. For instance, someone who loves to calculate things and look at problems from an analytical aspect may pursue a career in mathematics, accounting, or some other financial field. There are plenty of self assessing tests out there that will help you to pinpoint your strengths and weaknesses. People who more then likely don't like their careers probably consider it to be something that is mundane and repetitive. They begin to feel like robots in doing the same thing day to day. They need a little change in their lives and their current career doesn't provide them with any hope.
The key to any career path is to figure out what you like to do and apply it to a career. Take some of the tests that are out there to determine what career would be a good fit for you and try the careers that are in that category. If you find later on down the line you realize you made a mistake then slowly transition into a different career path. Trust me; it's not the end of the world!