A childhood belief about i'm different

I assume this belief came after reading a book or watching a movie, or maybe my sisters told me.
Anyways.
In my "past life," I had been kidnapped from my family at the age of twelve (The perfect age, as far as I was concerned. I think I was convinced it happened on my 12th birthday, actually.) by a secret facility that the government knew nothing about. There, they completely wiped my mind of personal memories, like my name, thoughts of my friends and family, and such, while retaining basic information like the names of colors, fundamental brain-functioning activity, what "trees," "rocks," and "gravity" were. Then, they put me into a sort of coma that allowed me to have dreams. They manipulated my dreams into teaching me all I needed to become an expert assassin while making sure I had no sense that *I* actually existed, as a person. Then, they woke me up, and after making sure I remembered what I had learned and could apply it in the real world, I was sent out on various missions, usually not to kill people, but to steal random objects or money. This, I assumed, lasted for roughly a year. Then, I realized, some how, that *I* actually existed. A single faint memory of something or someone wasn't completely removed. I escaped, on the run for roughly 3/4 of a year, 9 months. Then, they finally captured me, but fearing that I couldn't be trusted to be loyal to "The Agency," I would no longer be a part of their project. They couldn't simply kill me, because I had had contact with the outside world and a federal search would run the risk of revealing their project. This confusion lasted 3 months, to make another year. They then decided to completely wipe my memory of all my training, and, for some reason, decided to shrink me back down to a small child. Something went wrong, and I kept my intelligence capacity, although it was, for the most part, completely empty. This was all a complicated explanation as to why I was smarter than the rest of my class, and as to why I had a fascination with nooses.
Now that I think about it, it was definitely from some sort of book, don't you think?