I recommend this game to those who are hypersensitive to rejection: By Making A Game Out Of Rejection, A Man Conquers Fear
Look, everybody must come to terms with the fact that most people will not like us, or be interested in us, or want to help us. That's part of growing up. Despite that, there are plenty of people out there who want a friend. We have to understand that others, like us, are discriminating in their own ways. When friendships and relationships do click, it sure is fun and life-enriching, isn't it?
I once helped a very shy young fellow deal with his fear by commanding him to introduce himself to a pretty girl on a daily basis - including in NYC stores (eg Bloomingdale's), gourmet food markets, and supermarkets. He complied bravely with great faith in my advice, and in a very few instances somebody liked the cut of his jib and his (apparent) confidence and phoned him. Cured by Reality Therapy! He did not become thicker-skinned, just realistic.