Guys, why are some brothers/cousins so over protective?

Anonymous
Literally every boyfriend I've had gets intimidated by my brothers/cousins, I have two brothers one is 2 years older the other is 2 years younger and I'd say we're really close and I guess protective ofeachother I also have two cousins (they live with us) one is 3 years older and the other is my age. I guess you could say my older bro and older cousin have like a "reputation" in my neighborhood (not exactly a good one) so is that the reason why most of my boyfriends get scared?
Guys, why are some brothers/cousins so over protective?
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