Am I wishing for something that can't happen?

I really, really want to be an author. Truly, I want to be an author before I’m an adult (like s.e. Hinton or christopher paolini). Though I would be happy publishing a book at anytime between now and when I die. I write all the time, not just in language arts class. I also constantly have my nose in a book. I’ve let a few close friends look at snippets of stories I’ve written and they seem to like it. Of course, they are my friends and may just be being nice. All the stories I’ve tried to write have come to a point were I just don’t know what will happen next or maybe can’t put it into words. As I said before I want to be an author almost more than anything, but sometimes I wonder if I actually can. I’ve heard people say “you can do anything you set your mind to”. I know that’s not entirely true. No matter how much I practice, I’ll never be able to be a famous singer; my voice just isn’t that good. Nor will I ever be a morning person (stay away from me until after noon). So here’s my question: When do I say I’m just not going to become an author? Do I at all? Am I wishing my life away? Or am I just reaching for the stars?

By the way, just to give you an idea on how much I would like to be an author, if a jenie promised to grant me one wish, within the boundaries of reality, I would wish to be an author. Of course, reality might be different if there were jeanies.