Valkyrie Sisters VS

Right and Wrong, who has the right to be the judge of these things? What is truly right or wrong?
Humans naturally have the desire to look out for themselves, taking actions towards benefitting themselves. But for some reason this has been viewed as wrong, being selfish is wrong. Is something so wrong with looking out for yourself and only yourself.
My name is Rose, and I am this kind of person. I would gladly kill 20 or even 100 people if it meant saving my own life, but in truth wouldn't all humans do this provided that there isn't a moral backlash on them from people around them.
Though one thing always bothered me, of how a person can give up there life for another under the simple pretense of "doing it for love". I never understood it, I wonder what it feels like.