Your Parents, Similar To Harry, Were Killed By Voldemort When You Were Two(And A Half)Years Old.
Everyone, Except Dumbledore And Two Others, Think You Were Killed Too.
Dumbledore Found You And Acted As Your Guardian.
Everyone, At Hogwarts And Elsewhere, Thought You Were Just A Girl Unknown And Dumbledore's Apprentice.
George And Fred Weasley Knew Better Though.
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This Is Mostly Told From The Background And It's Starts In Book 4, Kind Of.
I Do Not Own The Harry Potter Characters Or Book/Movie Storylines.