If you can read this, then you already know about story structure. Do not fall into the trap of conflating the ability to articulate story theory with the ability to craft a compelling fiction.
You discover yourself not accomplishing what you declare yourself to be? You are a writer and yet are not writing.
Slay your dragon and free yourself from the fear holding you back.
Starting is the toughest part. Inertia is the strongest force in the universe to conquer, and if it took billions of years to produce your ancestors, why should it be any smoother for you on your writer’s journey?