I have a web start up that enables people to send handwritten greeting cards without an address. We have made it as cheap and easy as possible to help people send hand written cards to each other - It's a fun and meaningful way to connect with people. Everyone loves christmas cards right?
I actually think rejection is the key to getting better. I have been rejected before it's no big deal. YC is a big opportunity to progress, but it's not the only way to progress.