People say I'm pretty but, guys completely disregard me!?

Please don't misconstrue this as being conceited or bragging but, I do believe I'm pretty. My friends tell me I am. Random strangers tell me as well. In the bathroom once someone said I was very pretty and a guy once rated me as an 8. I get told im pretty every couple days. The thing is guys at my school completely ignore me. They make no effort to talk to me. I see them stare sometimes but they don't go any farther than that. (They dont smile when they do either) I'm pretty quiet but I do talk..... sometimes. I just don't know what I'm doing wrong! I feel like no guys like me. Ppl say "they're just intimidated by beauty" but Id think that they'd rather be rejected by a pretty person opposed to a less attractive one because it would be less of a blow to the ego. And second, I'm not drop dead gorgeous to the point of intimidation. Well. If u guys have any suggestions as to why this is happening or what I can do they would be greatly appreciated. Thank you :)