This is very important to realize, especially for anyone who is going through a slump or who is nervous about starting a business for the first time.
I am starting a firm effective early next year, and I have said to people that it will show whether I'm "cut out for being a solo." I have thought about it some more and realized that that's not true. I have to recognize the possibility of failure, but just because the business fails does not mean I am not capable of doing so at all. The only thing I can do is try my best, make mistakes, learn from them as best I can, and move on.
Your business is just a business. People's businesses fold all the time, but they will often come back with other ideas, many of which succeed. You do not fail simply because your business does.