Destined?

Okay?
So I have a feeling I have been chosen to change the world... To be destined to do something great, big... HUGE. But why? Why me? Everyday I stare into space and wonder, I dream about the end of the world and what i must do to stop it. But I'm a sixteen year old girl. With an average life. I go to school, I have friends, I have leisure activities I do and now I have to save the world. It isn't easy. I feel like I can no longer get close to anyone because I may have to leave them soon. I can't 'kick' anyone out of my life, nor will I ever want to. I want to meet people and I feel that is the only way of doing this but I am finding it hard to talk to people, little alone meet them. I wish I was outgoing and pretty and maybe then I would have a chance of changing the world. But since I'm not someone else should take my place.