If you want to be a rock star, you're not going to just walk on stage. You gotta go practice in the garage until your fingers bleed. I always say that - the same with writing and the same with filmmaking - if it's really your passion, you've just got to stick with it and do it.
Your mind just goes to the craziest idea to lure people into the theater, and then you write your script around those elements.
Anyone who can only write about themselves or their life experiences, in my mind, isn't a very good writer.