Slightly off topic but I just wanted to throw in my two cents worth about how I regard business failures in case it's of use.
Failures of varying impact WILL occur along the way. They can be prepared for & are not something to be scared of & as long as you learn from them you've gained some valuable experience & have discovered a way that something won't work. You might be a bit poorer than when you started but it's only money & you can always make more of it (if you doubt this at all you may need to rethink your entrepreneurial ambitions).
If you believe in a venture & have done your homework, prepare for what contingencies you can then get stuck in & give it a good go before pulling the plug. Perseverance is absolutely crucial to success.