Learning how to handle rejection is paramount for your freelance success. When you are at the beginning of your freelance career, rejection will often come in the form of declined proposals or lack of response to your cover letters, not getting invited to interviews, and not landing the job after a great interview.
Don’t take it personally. A single YES makes it up for all the NOs along the way. But until you get it, it’s important you don’t give up; that you learn from the rejections and keep on trying.