How do you turn rock music into metal on guitar?

I am 13, I play guitar and I have been trying to figure out how to play metal, but I have been having alot of trouble with it. Please do not leave comments about rock or metal being "the music of the devil" or something stupid like that.
Update: also, I have a guitar teacher, but I only see him once a week and for 30 minutes, and he does not know how to play metal (I think)
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