Why are we uncomfortable in our own body ?

I have met many people in my life some healthy some skinny, some tall and some short, some fair toned some dark, some with pimples and some with dimples. But among the people I have met so far about 95% people are not comfortable or satisfied with their own body or skin. Maybe you and I are also a part of it.
Have you ever wondered the reasons why do we feel so; after all it's our own body something we own by birth or have acquired later due to our habits then why to be ashamed of that?
In my opinion the advertising media has a great role in compelling us to judge ourselves dislike our body type. It leaves us wishing to be as fair, as slim, as tall as a top class movie actor. The advertisements portray the body type that we own in such a way that we start hating our self and make us feel that something that we are is really very odd in a bad way. Have you ever watched an advertisement of a fairness cream in which a woman in her late twenties is getting rejected time and again for marriage by various guys and that just because she is dark toned, but after she uses the fairness cream then magically she gets fair then there's a long line of guys waiting for their turn to offer a marriage proposal to the girl. Why to marry a guy who can't accept the girl the way she is? Advertisements like this make us feel worthless and we start hating ourself and god too which we believe has made us dark toned or fat or with marks. This is just an example there are a lot more that we still get to watch on the television.
The strategy of the advertisement is to create a sort of fear in our mind that if we are fat or dark or have marks all over the face then the society will not accept us, we will never get married or we will not get to achieve our dreams or we will not get any job. When this fear covers all our mind then we start using their slimming tea, fairness cream, height increasing drinks and many more and in this way the aim of the advertisement is fulfilled to increase their customers. You know what this is all bullshit. All that matters is the thought you carry with yourself the real you. No matter how fair, tall, perfect figure you have but if you have a negative thought then no one will like you.
Nobody will think you are beautiful unless you are comfortable in your own body type and skin tone. So come on chins up, walk tall as if you are no less than a top Hollywood actress because you are beautiful in your own and every way.