If you could write a book what would it be about and why

It would be about how people can suffer diabetes without anyone even knowing about it people deffinitly do not wish for it every single night no one likes it. it would be about hat because I have had it for 6 years and I am only 11. although now that I have said that you are probably not going to do that because I am 11 but you should definitely try it and learn something new about the world tht you might not have known before reading this.

If it were me a would write a fantasy book because they have a lot of action most of the times but this is your chose so be careful when you do it