We all have things that we don't like about ourselves, it maybe your laugh, or your hands maybe even your voice, whatever it is; don't you think it's insane that they can stop you? Stop you from finding yourself, stop you from meeting new people, or maybe stop you from taking a massive risk in life.
This 'thing' you need to overcome it, no matter how hard it is to. You need to accept that you're actually beyond compare, there's only one of you, so how can you compare a rose to a tulip? The rose has thorns but does that make it any less beautiful? The tulip may not stand out but does that make it any less wonderful?
You shouldn't feel insecure because those 'things' make up you, once you learn to accept them you can live your life to the fullest. Along the way you might find someone who not only accepts them but falls in love with them too and brings you happiness.