Reincarnated to switch places with a Princess

In my first life I died trying to save a kid from getting hit by a truck.

In my next life, I was reincarnated as a side character that was never mentioned in the otome game I played before I died.

I thought I could watch things from the sidelines as a side character but someone tell me why the villainess of the otome game, Cecile looks exactly like me and why the hell is she begging me to switch places with her?!?