Lots of guys with narrow shoulders are attractive! Even if people bulk up, slim down, and tone up, that's just muscle mass, and there's really only so much we can do about our bone structure. So I wouldn't worry about it. When a girl is into you, little things like that won't matter much, anyhow.
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You either need to have an above average face and an average body, or an above average body and an average face. Otherwise, your screwed.