Your outer appearance is a reflection of what you are on the inside. How will your inner beauty manifest itself to the world?
As cliché as this may sound, beauty comes from within. In less basic terms: your true self, including thoughts, beliefs, values, will all reveal themselves in your outward expressions. This is why it is so important to work on yourself from within.
Challenge yourself to be understanding and accepting of not only others but of yourself. Embrace your weaknesses and entertain your strengths. As a person confident and comfortable in their own skin, you will break down all kinds of barriers. Your inner beauty will bring about a beautiful, healthy, nurturing environment that will allow you to grow as a person.
In true happiness, you will never have a reason to try to be beautiful because you will simply be a beautiful soul. It will show. In all that you do, it will shine. Trust your ability to make yourself happy and let go of insecurities, doubts that have forced you to put on a facade of false content.