If you're currently unhappy in your work, it's not uncommon for you to have the desire to make a career change. Lots of people are going through this right now, with the changes in the current job landscape. A career change makes a lot of sense, especially if you've been at your career since you graduated from college.
These days many people have outgrown their current career. You're a much different person in your early years of working than you are five to ten years down the road. Maybe you were told by others at an early age what career path you should take. It may not have been what you wanted, but something you did because you didn't want to disappoint anyone. You can only go so far in a career that does not fit your needs before you finally hit a brick wall.
Once you hit that wall, it's often hard to face the fact that you need a career change. This can be scary for a lot of people. Many will remain in their comfort zone and stay unhappy rather than muster up the courage to try something new. Although it's scary to break out of the mold, once you start doing it you'll find that it's not as scary as you thought it would be.
As the Monopods would say, "They couldn't have put it better."