I didn’t choose to be hated

After running away from my family with the last belongings of my grandmother, I lost half of my memories and was transported into a fantasy novel, not as the female lead but as the sister of the second male lead.

If I remember correctly, this girl is fated to be hated by everyone all her life and die at the age of twenty in the female lead’s place.

I only have two years beforehand ?
Okay, then I’ve made up my mind. Let’s not be anywhere near the main characters and be happy until I can go home.

But why do I feel like I’m missing something ?