This story of yours is really amazing! Its helps alot, and it is giving me a good idea about what you need to do and be able to do so you can become a Mangaka. For me it started weird. I never knew what manga/ anime was when i was younger, just one day i was just scrolling on the internet for a new picture for my background (How interesting right?), and then i saw one picture with this beautiful cute girl in it, from then i kept looking and looking untill I figured out what the name was of that art. Ever since I started to learn how to draw manga characters and everything that is a part of a manga. Even bought many books wich I still use alot. Never fona give up on that dream 😉