What Should Friends Be?

I'm trying to decide if I'm an egomaniac.

As I think about my friendships, I realize the people I like to hang out with are those who build me up, who believe the best about me, who make me feel good about myself. They think I'm fantastic (even though they KNOW me) and make me feel fantastic when we're together. Are they my friends because they stroke my ego?

What is the purpose of a friend? Is it to make others feel valuable? What does it say about me that my relationships give me good vibes about myself? Is that bad?

What do you think about this? Is it a natural phenomenon to be bound to others in some sort of mutual admiration society? Or am I making my friendships all about me?

Am I an egomaniac?