Is it normal for a 15 year old girl to wear a thong?

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It’s just underwear. Unless you’re wearing them for the wrong reasons, there’s nothing wrong with it. 
Like if you want to wear leggings and not have your party lines showing, that’s completely normal.

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I’ve never worn thongs because I think they’re uncomfortable, but if you like them, wear them!

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I personally didn’t but all my sisters did at that age and possibly younger