I want to start by saying that there are no ugly women. There are unloved, unkempt, lazy in the end. Every woman is beautiful in her own way, and that's the beauty. Who told you that you are ugly?
For some reason, many associate beauty only with physical beauty. And if so, whose beauty do you take as a standard? Who are you comparing yourself to? In addition, each country has its own standard, and you say you want to be the most beautiful in the world.
Beauty is not only in the body, but in the way you hold yourself, how you say and what you say. There should be an energy that attracts, not repels - this is the most important, however, as well as the ability to maintain a conversation and create a feeling of warmth nearby, which is also very attractive. I knew many girls about whom they said that she was beautiful, but they were deeply alone, because they did not attract them to themselves. Such a cold and even, I would say, repulsive beauty.
Just being beautiful is not enough. For example, the well-known Cleopatra was not at all a beauty, but nevertheless bears the title of the most famous beautiful woman in the history of mankind. Jacqueline Kennedy was not a beauty either, but that did not stop her from having many fans and being the President's wife.
So pull yourself together, develop, take care of yourself, dress neatly and beautifully and be popular and desirable! I wish you success in this! Live for the joy of yourself and people!