Starting a business is a lot of work. Anyone who tells you it's not is either lying or has never actually started one themselves. The hours are long, sacrifices are great and you are assulted with new problems and challenges every day with seemingly no end. If you don't have the constitution to weather these things, your business could implode on you faster than it started.
Clearly, entrepreneurship is not for everyone. But how do you know whether it’s for you? You should start by asking yourself what it takes to be a leader because, for the most part, you'll be doing a lot of the work up front by yourself. If you can't lead yourself through startup, chances are you won't likely be able to lead your business and future employees through growth and on to success.