It took several years of being a pharmaceutical guinea pig, over and over, before coming to terms with the “problem” in this brain. It is fractured, and was at a very very young age. It is fractured into different people; different people with different feelings, different wants and desires, different interests, different memories. Different entities, sometimes at odds, wanting different lives. They are more cohesive now, the memories, than they have ever been. But that took both understanding, and time. While it is not always easy, we have learned to communicate with each other in order to try to live a more stable existence than we had in the past, separated, fragmented, and dangerous to one another.
It probably sounds strange, it probably sounds...who knows, maybe dumb or unbelievable to you. Who knows. It's not really like it's portrayed in movies either.
Just as there isn't anybody who knows how your mind works, or has not had the experiences you've had, or seen the things you have, neither have you of anybody else's.