The "Central Relational Paradox" is a term from Relational Cultural Theory.

The paradox is this:
If we change who we are in the hopes of getting people to like us, they will pick up on our lack of authenticity, often unconsciously, and they won't like us as much.

To further complicate things, if we do succeed at making friends by acting inauthentically, we will never know if they like the real us, leaving us in fear of rejection when they find out who we really are.

The moral of this story is to be yourself. You will make more friends and you will make the right friends.