I was actually shocked to see this, what you have is called a vore fetish known as voraphilia and feel the same exact way you do. Usually my fantasies are about being swallowed by anthropomorphic animals known as furries, but vore comes in pretty much all shapes and flavors whether it’s real life, anime, furry, or whatever you want it to be. Vore is extremely common among furries and bronies but by no means does it only pertain to those fandoms. I used to think I was the only person in the world that liked the idea of being swallowed whole and then around 11 or 12 during the age of puberty I guess I kinda sexualized it and found out I wasn’t the only person and after years and years I admitted to one of my closest friends I’ve known for years and years all the way back to middle school that I was into vore, and she told me that she was also interested in it as well. So don’t feel alone or ashamed, it’s far more common than you might think