Girls, how can a small girl beat up a big guy?

Anonymous
My brother and my cousins are like twice my size and they're constantly shoving me around and hitting me or stealing my things. I've tried talking to my parents, but they always side with my brother, even when he gave me a black eye they thought it must have been an accident. How can I fight back against them without like poking them in the eyes (I don't think I could do that) or using any weapons or anything?
Girls, how can a small girl beat up a big guy?
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