Entrepreneurs are the happiest workers of all, according to a new Gallup survey from Well-BeingIndex.com.

The power of being your own boss, making your own decisions and choosing how much or how little you work is key. Entrepreneurs tend to be self-starters and they generally don't do well in a bureaucracy.

Interestingly, Clark and all three of his siblings are all entrepreneurs. Some have suggested it's because they don't like being told what to do! It's certainly true that you only have yourself to credit or blame when you call the shots at the head of a business.

Entrepreneurship is a very self-selecting process as well. Some people who get into it realize the work is just too much and promptly get out of it.

Clark was 25 when he opened his first travel agency. At that time, he worked all day everyday to the point that he would forget in the morning what time of year it was. Did he need a coat? Should he wear short sleeves?? He was that focused on his work that everything else just became a blur.

The consumer champ also used to wake up with anxiety-based insomnia for about four months when he first launched his business. After the fourth month, he made a profit and was able to get a good night of sleep! Entrepreneurship is not for everyone.