How can you tell if you are a half -vampire born?

well, first if you are attracted to somebody who's bleeding but it doesn't seem like it's their blood that's doing it ... it probably is. And if you ask your parents (as weird as that sounds) they would know because one of them would have to be a vampire for that to happen ... and if your allergic to vervain and/or hate hate trees and would then that's probably why ... and if your extremely sensitive to light - like more than normal - then that's a clear sign. There are probably a lot of other ways of knowing ... but that's all i can think of!