He's A Girl??!

I always read scientific books about reincarnation, but I never believed that one day I would die and be reincarnated. Oh how much I wish to die as a normal human, I wish I died because of sickness or age, but the thought of being killed by my own brother never crossed my mind. I promised mom to stay strong, and that no one will find out that I'm a girl, will I be able to fulfil that promise?