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If you are truly an anarchist you have to be non-violent. The desire not to be ruled is not more important than the desire to not rule anyone else. You have to have both for anarchy to exist.

Do you believe that defending yourself is a bad thing? Immoral? If someone attack you is it better to be killed than to fight back?

No, I don't. I defend myself

Well from my understanding of the the word nonviolent it means Nonviolence (from Sanskrit ahimṣā, non-violence, "lack of desire to harm or kill") is the personal practice of being harmless to self and others under every condition

As I see here is "under every condition" not allowing self defense. The rest is all good. On the other hand The non aggression principle is:

"No one may threaten or commit violence ('aggress') against another man's person or property. Violence may be employed only against the man who commits such violence; that is, only defensively against the aggressive violence of another. In short, no violence may be employed against a nonaggressor. Here is the fundamental rule from which can be deduced the entire corpus of libertarian theory."

I see the practice of Ahimsa as the very first step in Patanjali's Yoga Sutras and the very first step towards creating lasting peace. In practice I actually align more with non-agression currently but I can imagine a future where ahimsa is practiced by everyone.