Rejection is an avoidable part of life. Nevertheless, rejection is a very painful experience. But life would be very boring without it. A person that has never experienced rejection is a sheltered little fuck with a perfect life; someone who has never had to work hard for anything. A person that is a stranger to struggle, pain and rejection is not worthy of respect. Even those people with "perfect" lives that never experience rejection are miserable. Look at any young rich celebrity; they're all strung out on all types of substances. Rejection is an experience that makes us all stronger. The world is a hard and cold place. Not getting the girl or guy of your desires or not getting to live the life you want will only give you the inspiration to try harder and improve yourself as a person.
I'm 26 years old and I have experienced rejection my entire life. But every time I look in the mirror I think "Damn, I am one handsome lucky bastard..."