People become entrepreneurs for many reasons. Sometimes it's just because they cannot find a job that pays enough, is interesting enough, or challenges them enough. Other times it comes after a long life of working for others and moving up in a company and then realizing that they can do more with their own business. Yet others start a business because they want time freedom and flexibility.
While there are many reasons for becoming an entrepreneur, it's critical to choose the right business and run it properly if you want to be successful. It's fun to say you're an entrepreneur, but it's a whole other thing to really do it successfully.