I presume that, ever since your early teens, you have engaged in acts that society frowns on, and have felt no remorse and guilt. And ever after, anyone who knew of this diagnosis has expected you to continue with antisocial activity. Most importantly, YOU knew of the diagnosis, and had this expectation. That's what I mean by saying that a label can be a prison. It is also a copout, because if you didn't have the diagnosis, you couldn't use it as an excuse.
Habits are hard to break, sure.
But the only way to break them is to try. So the diagnosis has become a self-fulfilling prophecy. There is hope. I must assume, it's because you want to change. And that is the ONLY requirement for the attempt to be successful.