You are mistaking metal with hardcore, metalcore (should not be considered metal), and deathcore. Look at pictures of metallica, slayer, and avenged sevenfold. They are definitely not skinny with whiny screams and long hair.
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Metalcore should very much be considered metal, don't tell me you're one of those douchebag snobs that go around saying "that's not [i]real[/i] metal".