We got rejected, it's now a bummer because we really dreamed of going to California. Now we have to do it ourselves and I believe that if you can't bring up the motivation to do it without YC, you will even have had a hard time at YC.
--> JK Rowling got rejected lots of times, not a lot of publishers wanted to publish her book. Sylvester Stallone had a hard time bringing Rocky to a succes and so on... So, I believe rejection is not fatal for our app!
I wish you all the best of luck with your startups, with or without YC! :)