I got reincarnated as a main protagonist in a mob protagonist novel

Everyone wants to be a main character,right?

suddenly becoming famous and getting any girl you like.
beating up bad guys and saving heroines.

...but I'm not even a bit happy,even though I got transmigrated as a main character of an action and romance novel....but it's a mob protagonist novel where the main character gets reincarnated as "Alex Turner" a mob character but with his knowledge of future he becomes invincible.

meanwhile the actual protagonist "james usher" who is a justice maniac becomes the main villain and soon gets defeated by Alex.

the girls of his harem also leaves him.

and now I'm in a body of that very person...but I'm not gonna be a moron .

I will survive!!!