Wow I can relate to you 100%.
Growing up I would constantly mimic characters in movies or tv shows or books that I found cool or attractive in some way. To the point where I feel like I modeled my personality around them. (and similarly, it even extended to physical habits, such as how I stand/walk)
And similar to you I had a particular... affection for "f*****d up" lives or people. I modeled myself on self destructive people because I found a certain glamour in it all. In their struggles.
Here's a piece of advice though. I don't know how much you take it, I know I certainly wouldn't have back before I know what I now know, but honestly it leads to nothing good. When you reach your goal, ie have some kind of f****d up issues going on and self destructive behaviour to go with it, that's when you realise the true meaning of when they said their lives were a "struggle."
Honestly, it's a complete nightmare. Not only do you feel you've become this pathetic person who can't do things right, or achieve your dreams or idk whatever it is, but you live with the sickening knowledge that you put yourself there.
You didn't end up that way due to some kind of negative external factor, you made yourself unhappy. And then suddenly you've got no idea how to reverse it. And let me tell you, making yourself a happy and healthy person again is a heck of a lot harder than sliding into destruction.
I do honestly hope that some of this advice is helpful, but I have a feeling you might glamourize it or sth anyway lol