Lets say you lose $50 in a new startup that you had just began!! whenever something really bad like losing $50 happens most of us if not all of us tend to think why is it happening only to me?? what a loser I am?? This feeling of remorse is not going to help you earn the $50 back, what you lost is lost forever. Then what is the point of sitting in a corner and thinking about the $50 you lost, Yeah thinking about the loss is good if you think about the mistake you made rather than the monetary loss that occured due the mistake.The thinking process should constructive Analysing the mistake you made will help you in tackling the similar scenarios in future!! So stop feeling guilty and start learning!!! I am not asking you to think positive all the time its impossible but most of the time As warren buffet says" I need not do too many rights as long as I dont do too many wrongs"