Reborn As A Villainous Sister

I was like any other teenager in highschool, who loved to be in fantasy world more than real world, aka I loved to read romance novels. I guess?
I always slept reading Romance books. Like any other day, I slept that night reading a popular book, but there is a catch of course. I woke up in another world which was? Yeah, that novel namely, "I'll love you for eternity!".
But I was a bit happy to know I book travelled, till I got to know that I was actually the villainous Twin sister who dies in the end? Wait what??