I'm not a girl but why would u want to wear guy's denim? They're much looser, baggier & definitely not form-fitting. They don't hug your ass like girls jeans
I guess you could try some of the super-skinnny's like Levi's 510's or ones from Uniqlo. APC's Petit Standard is pretty skinny but stretches out like mad after a couple yrs of wear. Comune also makes very slim/skinny cuts but I don't know how they wear or stretch after repeat washings. Just watch out cause most men's jeans have much higher rises than girls jeans, so it might look like grandma trousers with the waist up to your bellybutton!