You really shouldn't think like that. (although I know we all do!) (even top models do and probably even worse cuz they're rejected on a daily basis bc of looks stuff!)
Se7en and some others are starting a really nice series on beauty
. They've already posted one article that you *must* read. Here are the links:http://www.suhaibwebb.com/relationships/withthedivine/divine-beauty/
Intro to series: http://www.suhaibwebb.com/ummah/women/introducing-a-new-series-reconstructing-beauty/
Basically you just have to change your thinking on beauty. Look at pictures of beautiful men and women when they were younger and older! How temporary "looks" are. Hate to bring up Aish... but even the most beautiful woman in the world is being criticized after her weight gain. It's just such a temporary thing. Real beauty is beauty of character and Imaan. That makes a person sooooo attractive! You know something to think about is why we will be 33 years old in Jannah. In modern standards this is really old and no one is at the "peak of their beauty".
As for girls, cuz ur at this young age, you might be thinking that all girls think about is looks. and yes at an immature age they're all about finding someone 'good looking' etc but believe me not all are like that, and most realize very quickly that is not important at all in the scheme of things.
Also looking in the mirror we should say this dua:
الحمد لله الهم كما حسنت خلقي فحسن خلقي
Alhumdu lillahi Allahumma kama hasanta khalqi fahassin khuluqi
“Oh Allah! As you have beautified my outward/physical appearance, then beautify my inward appearance (character)”
And Allah has
beautified our outward appearance and created human beings in the best of apperance. Believe me you must travel to India or other countries to see how horribly disfigured or tragic some things are. Just view some of the Muslim men and women poor victims of acid attacks. And view some very old shaikhs and shaikhas in the old world who have never missed a single Salah in the Masjid. They are old and wrinkled and stooped and yet they are the awliyah of Allah, the most beautiful of his creation.