I'm sorry about my name
Why are you sorry about your name?
I'm sorry that my name means death
Even though coming up with a username is difficult, it is not nice to have names that can be offensive or hurt others. In some places some usernames can get you banned. Changing your username can help you to avoid having to apologize in the future.
I remember now it was to annoy my parents because they call me Death. They say I'm all death and no life.
I'm sorry that your parents call you "Death." I don't know what they were thinking, but they shouldn't have been using a term like that to refer to you. You should reject that handle and change your name to something like, "Joie de Vivre," especially now that you realize they were misguided.