What if I was bullied by my own sister and almost lost my life?

It depends on what kind of bullying it is, whether it involves domestic violence or what she thinks is a joke. If it is the former, I suggest you talk to her and your parents first. If not, I suggest taking legal procedures. If it is the latter, I suggest you talk to her calmly alone and tell her how you feel under her bullying. If she doesn't understand at all or refuses to change her mind after repeated education, I suggest you turn your back on her, that is, quarrel (don't be too impulsive) to make her realize the seriousness of the matter.