Does this sound typical of a stuck up girl?

I'm a 17 year old brunette with blue eyes, slightly tall, and average weight. I think I look kind of like a less attractive version of this: http://www.marieclaire.com/cm/marieclaire/images/Yy/rb-long-hair-1-0809-lgn.jpg I don't think I'm that attractive, but a lot of guys seem to like me. I've... show more I'm a 17 year old brunette with blue eyes, slightly tall, and average weight. I think I look kind of like a less attractive version of this:
http://www.marieclaire.com/cm/marieclaire/images/Yy/rb-long-hair-1-0809-lgn.jpg

I don't think I'm that attractive, but a lot of guys seem to like me. I've caught guys staring at me a lot, some have constantly tried to talk to me (I always reply politely). One guy blushed every time I was near him (he's sweet, but came on strongly). There was this popular guy who's friend urged me to go out with him; eventually I talked to the guy personally and told him I wasn't sure if I was ready (which was the truth). And I've had guys at tables saying things like "yo, check out the rack on her!" I hate when guys do that (it's happened at least five times). I've been asked out a lot, but I've never dated (I try to have tact when refusing). On Friday I heard a group of girls calling somebody stuck up, matching my description. I felt so bad, really, I don't see myself that way.

I don't know why guys like me, I'm not a flirt. I'm very shy and quiet, I only have a few close friends, and it's just with select people, not a posse or anything. I don't really start conversations with people, they usually start them with me. I'm not really a party-goer, so typically my Saturday nights are spent reading or daydreaming. My self esteem depends on my mood, which sometimes changes by the hour but not outwardly. I get good grades (lowest mark is 81%) but that's only because I do what I have to. I try my best to be nice to people.

And my style is different. I dress conservatively, not much colour or skin. I usually just wear jeans and a T. But I wear certain dressy styles sometimes. I'd wear outfits like a red sweater, black skirt, nude hose, and black heels; or a black sweater dress with nude hose and heels. Yeah, I wear hose; I don't like to show too much skin. But not shiny hose - usually they're semi-sheer, a bit thick, and have a reinforced toe. They look like this unworn: http://upload.wikimedia.org/wikipedia/commons/0/0b/Pile_of_pantyhose.jpg
Sometimes with a skirt/sweater on a cold day, I wear a bodystocking (pantyhose that go up to the neck, with sleeves): http://www.xyfww.com/11WZ/773B.JPG
I prefer heels over flats; I think they look nicer.
I'm self-conscious of my toes, so I rarely wear sandals. In warm weather I wear these: http://www.shoe-shop.com/content/ebiz/shoeshop/invt/sch170908/sch170908_Black_l.jpg
Sometimes I like to curl my hair.

What am I doing that's giving the impression I'm stuck up? Is it because I've never said yes to being asked out?
Update: No, I don't understand why they like me. I don't even think I'm all that good looking. I'm not outgoing or attention seeking. I don't get it.
Update 2: lol yes, I like never have anything to talk about.
Update 3: I only wear hose when I wear a skirt or a dress; never below my pants.
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