Why are many big brothers so over protective?

Anonymous
Sometimes it's hard for me to understand why my brother acts like he does. He's 11 years older than me, but we spend a lot of time together and I know and are friends with a lot of his friends. Sometimes when I'm with them my brother will make some joke about one of his friends and I being a couple, or if I sit close to him and talk and my brother sees, he'll come over and ask "are we family yet?" It's always super awkward. Either he's joking about it or telling me I can't date/ have sex/ know what a thong is before I'm 60. There's no in between. But that was a sidetrack. Why are some brothers so protective?

Why are many big brothers so over protective?
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