try to keep your skin clear, wear nice clothes, try to smell nice, keep your teeth clean! but dont go for the revealing clothes. respect yourself in that area (if you dont, no one else will for a long time) and try to be yourself!
There are few people in this world who were born without the ability to make themselves beautiful, and even less who were born without the ability to make themselves ugly. If you have a great personality, it will make you seem prettier. Make sure your hair cut, clothing, and make up attribute to your best features and flatter you.
Just saying that everyone's beautiful some people can't see it. Lol I hope I don't sound annoying:) Wear nice decent clothes,wear basic makeup (optional),fix your hair,TAKE A SHOWER,have a great attitude and ba-bam! Pretty you are