I am an avid science fiction fan and, recently, writer as well. I believe that all theories are possible, and that there is a world out there where all our ideas may be true. I am a believer in aliens and in the multiverse theory, and I love to believe that my favourite stories are actually being lived in a universe out there. 
That is part of the reason why I started writing my new book series, The Worlds End, which follows a small group of four teenagers as they attempt to stop the end of the world from happening multiple times. They're basically always in the wrong place at the wrong time, but they make it work. The series will be split into five books, so keep an eye out for the first one, which will be published here very soon: The Cold Core. 
Everyone can write a story. Anyone can. You just need the discipline and the passion to do it. With those two, you can write anything you want. So get writing friends. :)