It wasn't my first rejection mail that I've ever received. After the simple 'nice' opening, rejection mail will be always followed by "However, we truly regret...." and a short thank you note which you barely read at all. You know what it means. You understand that you are not the one they are looking for. You failed.
I was there, crying over the rejection mail(s) that I could never change. There were times when I thought that rejection means a failure. Not good enough. A dead end. Rejected. Wasted. End.
I think it is normal as a human for longing an 'acceptance'. In this industrialized era, we tend to translate 'acceptance' as part of success indicator. As a product of the modernization itself, I accepted the norm as a fact rather than 'an opinion'. It was until I learned it myself on my path towards adulthood.
As I value 'acceptance' more than rejection, receiving acceptance means a morale boost - only to learn that world is not as simple as Math. There were times, I learned that acceptance letter(s) led me to what I called 'the biggest learning' since it ended up with huge mess. In other times, rejection means another opportunity. The biggest rejection mail I got teach me that in the end that was the sweetest mail I've ever received. Without that rejection, I won't be here - able fulfilling my dream much sooner than I've expected. Yes, rejection is always hurt, but it lasts until you understand that probably it is the best thing that happened in your life :)