I think it's fairly common for men and women to feel a certain pride/confidence when it comes to their body-parts. Particularly, if they believe that part to be more unique, more of a rarity and possibly more attractive than the norm. It's a double-sided coin, of course. Those who feel the body-part(s) in question are less than satisfactory in some way, whether it be size, shape or appearance - feel far less-confident as a result. As we know from history, people have been successful in many forms and appearance hasn't altered that success for a lot of them. Even with that knowledge, people are still greatly bothered by their body. Confidence is all in the mind - it just needs to be unlocked. We are visually-focused creatures and as a result, instinctively see our bodies as our biggest problem.
We find flaws, aim for improvement and generally hope to be 'better'. It doesn't matter what the body looks like, it's how the body should look, in the owner's mind. There's a fine-line between cockiness and confidence. When that out-going nature, the pride, is achieved through the body; cockiness is often more in control than confidence. For many people (in my opinion), the 'body is best' attitude will fade fairly quickly - if it was ever there at all. They realise there's more to a person than that. Sometimes, they'll grow depressed when they see the truth and in time, that kick-starts a more productive life. Or, they may remain happy as they are but through a friend, loved-one or life-changing decision gradually grow wiser and subconsciously, at least - happier.
We all want to be better - strive for greater things. The problem is when that desire (body or mind) dominates your life. As Ms Dolfette said, confidence doesn't come from a body-part - it's just lumps of meat. It's different for everybody, but I feel no better or worse in my skin. There are sometimes things I don't like about my body, yes - but it doesn't get to me. I know that deep-down, I'm a man - viewed differently by everyone. Not just my body, but everything about me. Why focus all your passion and confidence onto a body-part/characteristic when the next person might hate it? As long as you remain true to yourself, it doesn't matter. We find true love, friends and happiness by being ourselves and having confidence in who we are. So, whatever quality it may be - physical or not - you're still a unique human-being. That's what makes you happy. That's what gives you true confidence - being yourself.