"My Life had stood" is all about our speaker’s relationship to violence. Without knowing what it is that the speaker would kill, and without knowing exactly what would kill her, we know for sure that the speaker is wrestling with her own power and with the idea that she is capable of taking life away. Spurring this violence is anger. When you think of violence, you probably think of a punch in the face, and you wouldn’t be wrong. However, violence can come in many different forms. There’s spiritual violence, psychological violence, emotional violence – anything that can count as "abuse." Violence is not always physical, so it doesn’t necessarily leave a scar you can see. More often than not, it’s more complicated than it appears.
The speaker seems to destroy things outside of herself with violence when, in reality, she is self-destructive.