Take it as part of the process. And also try to learn something from each rejection, this way you can look at thing in a more positive way

Do you ever wonder what if I fall on the ground while walking? I think no because it is part of the process. Take it like proposing to your crush. If she says yes, good. If she says no, you know where you stand and what you need to know. Without proposing, she will remain your crush forever.