Please calm down. Before YC, there were others that were able to build businesses and were successful. People are often so bent on getting into YC, TechStars etc. that they forget they can be successful without them.

That being said, even if YC takes you in it does not mean you will be successful. Others have actually failed after getting into YC.

So stop being angry and get YC out of your head. Focus on what you think that great idea is. Rejection although hard should serve as motivation for you. So don't quit what you are doing if you think it is great idea.

Winston Churchill said: "When you are going through hell, keep going" so do exactly that.