your hymen is a piece of skin at the opening of your vagina. some girls have one, some don't. if you do have one, it will break the first time your vagina is penetrated, if it hasn't already broken (which it can do easily).
if it is your hymen it is NOTHING to worry about. it happens to everyone! in medievil times, the hymen was used to determine if a girl had lost her virginity or not :)
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