When you are 15 years old, it's not the right time to wear contacts lenses, colored contact lenses are even worse than contacts lenses. Because someone is in this young age, her/his body is still immature, including the eyes. And wearing contacts lenses will disturb eyes' growth .Actually, colored contacts lenses are a fashion in these days, but it's really not suitable for such a young age. If you really want to look pretty than before, you can choose a pair of fashionable glasses, some glasses look cool. In the meantime, I think you can go to the hospital to have a examination for your eyes, maybe doctors can help you to regain your original sight so that you don't have to wear contacts lenses or glasses.