"Angry Birds was Rovio's 52nd game. They spent eight years and almost went bankrupt before finally creating their massive hit. Pinterest is one of the fastest growing websites in history, but struggled for a long time. Pinterest's CEO recently said that they had "catastrophically small numbers" in their first year after launch, and that if he had listened to popular startup advice he probably would have quit.
Startups are hard, but they can also go from difficult to great incredibly quickly. You just need to survive long enough and keep going so you can create your 52nd game."