If you want to become a fashion model then you should look to become proactive about putting yourself out there so that you can be discovered. You should have a friend or maybe even a professional photographer take some photos of you for a portfolio. These snapshots are often called head shots. After you have a portfolio put together you should go to a modeling agency or try to et the attention of a talent scout.
Being discovered and then circulating within the business is a goodway to put yourself out there for any opportunities that might arise for you.Remember to be persistent. You are going to get some no's but you have to just keep trying until you get the yes's that you want as well.