Which type of girl would a guy go for in middle school?

Okay so I'm the clean-cut girl i wear no makeup and am basiclly all natural...im really thin and 5'3 but i dont have that big of boobs and i dont act like a slut im very modest and dress very classy instead of trashy like I dress like spencer on pretty little liars.........why do guys like girls with the plastered eyeliner and mascara who dress like sluts and have big boobs and are easy and some of them are fat too i just dont get it! Why dont guys like girls like me?