Being a teen, this will go through your mind a lot. Best thing to do is have confidence in yourself and not worry about it ! Worrying about it will just make things worse. Be confident and be yourself and a good person and you'll always be good looking !
Lack of confidence. Don't worry about it. Like the rest of us you are probably average. More or less.
I used to work with a Japanese woman who was undoubtedly the ugliest woman I ever met. Until she smiled -- which she did often. She had the happiest, friendliest smile I've ever seen. If you work on your personality people will see you with much more generous eyes.