It’s a state of mind. It’s the perception that you lack nothing. That you are equipped with everything you need, both now and for the future. A person confident in their social life will feel as though they lack nothing in their social life. A person with no confidence in their social life believes that they lack the prerequisite coolness to be invited to everyone’s pizza party. It’s this perception of lacking something that drives their needy, clingy, and/or bitchy behavior.
(Via Mark Manson)