Receiving rejection letters is par for the course when you're trying to become a published author, but if everyone who ever received a rejection letter gave up the world would be devoid of print media.
The trick is to try and try again until a publisher is willing to take a chance on you, either that or get an agent who won't take no for an answer.
JK Rowling took to Twitter to share some of the rejection letters she received under her pen name Robert Galbraith received before the Detective Cormoran series made it into print.
The letters are a little hard to read but the message is clear- don't give up on your novelist dreams until you've literally run out of publishers, then self publish the books and move on!
-Via Cheezburger