It is damn near impossible to reach huge success without going through multiple set backs. Doesn't matter whether you come from a poor family or rich family. In the end, we are all human and all humans make mistakes. Aside from myself, there are no perfect human beings out there. Ahem.
What happens when you hit some sort of defeat or setback? One of these three things happens:
You Quit - You are so defeated that you totally give up. You accept that you just aren't good enough and run away. Sissy!You Accept - Again, you accept the defeat but you don't run away. Instead you just continue with the status quo and will probably continue to be defeated in your future plans. In other words: You live life on your knees!
You Fight - You accept this setback, but know it's not permanent. You get up, figure out what went wrong and try again, usually with huge success!
Study your defeat and try to learn what caused it. 99.9% of the time your setback is a direct result of one of your actions.
It's similar to scientists studying any illness. Find out the cause and stomp that out in some way.
So next time you fail at something, don't get down on yourself. At least you tried, which is more than most people do! Instead take the failure as a learning experience. Build off that to educate yourself so you don't make the same mistakes in the future.
When you're knocked to the floor, if you can't get yourself back up, how can you possibly move forward?
I just finished reading the book The Magic of Thinking Big by David J. Schwartz. There is a chapter dedicated to this exact subject and it really hits the nail on the head. The book is an excellent read, although it can be a bit slow in some places. It was originally printed in the 50's and the style reflects that, but I still highly recommend it.