Judging by some of your posts, it seems to me your main issue might be that you struggle with what goes into a story and how to put one together. Structure, IOW. Which means the advice to simply sit down and write, while being great advice in other circumstances, could be premature in this case.
There are likely any number of books out there on the subject of story structure. I don't actually have any on my shelf, except maybe The Writer's Journey by Christopher Vogler. You might find it useful because of the way it discusses character and story archetypes, and the myriad ways they can be used, combined, and/or inverted to tell a compelling story. There is hardly a novel or movie out there (at least in the western hemisphere) that doesn't follow some form, however changed and disguised, of the hero's journey.
I'd suggest you do a search on Amazon for books on story structure and see what turns up. Maybe someone here can suggest one or two.
Bottom line, in order to tell a story, a writer has to understand what makes a story, and different writers come by that knowledge in different ways. Nothing wrong with educating yourself on it.