Ayn Rand wrote along the lines of: "It's not selfish to do what you want. It's selfish to make others do what you want". Another quote of hers I like: "One man's need is not another's responsibility".
Youre only 'not selfish' if youre willing to do anything for any of your friends or a even stranger for that matter
I agree with mahno and the thing that Ayn Rand said Is that from the Virtue Of Selfishness? Gotta read that.