This is merely the framework to determine what is moral and what is not. An infringement on self ownership is therefore known to be immoral.
Anarchists do not believe in a utopia, but simply oppose such immorality consistently. This means we understand it’s wrong to infringe on individual rights whether such be done by private thugs or by “government.” Government is simply the largest and most severe aggressor on the planet, which inherently *guarantees* infringements of individual rights. They currently get away with it merely because too many people assume this group has the right to commit wrongs.
Now to answer your question very directly…
You are not obligated to allow yourself to be victimized, so you have a right to self defense. Since you have a right to defend yourself, others have the right to defend you as well. Further, you also may have the right to justice/restitution.
There is no guarantee one won’t be wronged or that justice will be served, but this is the exact same scenario as today with the existence of a ruling class. The difference is that the ruling class quite literally only *guarantees* you *will* be victimized. Government does control you, exploit you, decide how much of what you earn you are ‘allowed’ to keep, and lord over you by threats of violence. Try trading with another individual, owning a vehicle with dark tinted windows, cutting someone’s hair, selling food or beverages, building a deck, earning an income, owning land, going fishing, leaving the ‘country,’ etc.

