If what others define as a failure you see as an opportunity for an upgrade, you are a true entrepreneur. You should also be a bit crazy to overcome doubts that will come from every direction. The first time something doesn’t happen the way it’s supposed to these doubts will increase. This is when you should ask yourself what you did wrong, what can be done differently, and how you can approach it from a new angle. When you are sure about your place in the competitive landscape and you have something your customers need, it is not a failure. It’s an opportunity to improve.