A small correction to this, your friends don't really like you due to any desirable attribute you have, its not an exchange process. They like you for your you-ness.

Think about a friend, what is it you like about them? I think you will find that it's not a series of attributes, but a rather unquantifiable them ness - you like the fact they are uniquely them, this is how you are seen as well. You're enough.