insecurity

If I asked you how you felt about yourself, you'd maybe say that you're content with who you are, but that you see room for self improvement. This is because we've been taught that it's more socially acceptable to hate yourself than to love yourself, so we constantly pick out flaws in ourselves. 

The reason we pick out flaws in ourselves though is because we notice flaws in other people, and instead of accepting the person for exactly who they are, we concentrate on what is 'wrong' with them. There is nothing wrong with them though, we've just been brought up to believe that there always has to be something wrong. Nothing can ever be perfect, so that surely means that everyone has something 'wrong' with them. 

No. 

There is nothing wrong with anyone. We are all different for a reason, it's just not always clear what the reason is. People can look, sound, be or act different to us, but nothing is wrong with them. By believing that something is wrong with them, all you're doing is telling yourself that there's something wrong with you, hence your insecurity. 

In order to feel secure within yourself, you need to learn to love yourself and those around you. It's the only way.