Why are brothers so over-protective?

Anonymous
OK so I have 5 brothers (28.25.23.16.8) I'm 21 they are way to over protective even the 8 year old. once a guy started to flirt with me he came up to me held my hand and called me mommy. I toke my 16 year old brother to Wal-Mart, a guy kept checking me out, he went up to the guy and said ''shes off limits'', I went to go to my neighbors house to see if I could borrow an egg from him, my outfit wasn't the most conservative, I had short shorts and a grey shirt that stopped just before my hips but, my 3 eldest said since my neighbor is 32, that he might kidnap and rape me. so what I'm asking is why are brothers protective of their sisters its ridiculous. Any advice on how to tell them to control their protective hormones?
Why are brothers so over-protective?
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