What are guys actually into? cuz it seems like all they care about is how hott a girl looks?

ok, im in 8th grade gonna be a freshman next yr right...well i know i seem young and not very experienced with guys and stuff, and im not...but every guy that i have liked has turned me down bcuz im not exactly skinny, i dont dress skimpy, and my arent exactly the biggest...why are guys so obssesed with this stuff? doesnt the mind and the heart matter at all anymore??