So, if you do face a "no" or some other denial, it's important to keep a proper perspective. For example...
That "no" is just one more reply on the way to your final answer.
That rejection could have been for any number of reasons that had nothing to do with you.
That missed assignment may have kept you from doing an even better assignment down the road.
That missed opportunity may point out what's still lacking in your resume or relationships.
That criticism could have some seeds of truth which will allow you to grow.
The point is that rejection happens in life. It happens to everyone. It happens to star college football players who get passed over in the NFL draft. It happens even to famous actors who don't get the part in an upcoming movie.
Speaking of actors, remember these words from Syllvester Stallone: "I take rejection as someone blowing a bugle in my ear to wake me up and get going, rather than retreat."