Pete Hautman 
Sweetblood [EPUB ebook] 

Sixteen-year-old Lucy Szabo is Undead — at least according to her own theories about vampirism. Lucy believes that the first vampires — with their pale skin, long teeth, and uncontrollable thirst — were dying diabetics. And she should know. She’s a diabetic herself. When Lucy becomes involved with Draco — a self-proclaimed "real" vampire she meets in the Transylvania Internet chat room — her world begins crashing down around her. Caught up in late-night parties and Goth culture, she begins to lose control of her grades, relationships, and health. Lucy realizes she needs to make some important choices, and fast. But it may already be too late.