I don't know how I missed this when you posted.
All I can do is tell you what I find attractive and I think many other guys do too.
Mainly, be yourself. Fake anything is a big turn off. No one likes being misled or lied to.
First I suppose the eyes have it, hers and mine. I notice eyes and physical appearance first because that's what you see first. Then if I have a chance to get to know a person more, confidence and competence is BIG.
Whatever you think is wrong with your body --- it's NOT. We all like different things so we all like different body shapes. If you are worried about yours think about this. Of all the guys in your class there surely are some you don't find attractive at all, some who are drop dead handsome and the rest are somewhere in between. Guys see girls like that too no matter how much the sex magazines try to make us believe they all have to have big boobs and certain shaped hips legs. It's just not true. Right now I think Kelly Ripa is really sexy and so is Kirstey Ally. That is certainly a contrast but they both would turn me on for their looks. Now, once I met them, they both could turn me off quickly due to attitude.
So BE YOURSELF.