Is it normal for a teenage girl to notice other girls? Like, think "oh, her hair looks so pretty like that!" or "I wish my legs were skinnier like her's are". I am a straight girl, but I was wondering if it's lesbian-like to pay attention to these things. I sort of look just because I am very self-concious about myself, especially my face, hair, and legs.

and to be honest i'm glad you're being complimentary when you see someone who looks nice.
There's been quite a few girls here of late who see other girls who look good and instantly call them "sluts" or 'whores' because they're jealous.