I think that teens are attracted to vampires for a few reasons:
1. Feelings of social seperation
2. Teenage drama/vampire drama
3. Burgeoning physical desires
4. Grim beauty
Found this:
Vampirism
Melton identifies two groups of vampires who are involved in the Goth scene: “the metaphorical vampires, who adopt such trappings as sleeping in coffins, wearing fangs, and keeping nighttime jobs; and the ‘real’ vampires who drink blood and exhibit a psychosis. Many cross the lines of these groups, but almost all of them are adults with marginal incomes ‘who appear to be living out a fantasy world.’”16 The Los Angeles Times notes that the second group of vampires’ “lifestyle is beyond mere trend. They avoid the sun at all costs. Some drink blood and perform ritual magic. Most claim to possess psychic abilities. Some say they are tormented by wandering spirits.”17
The line between “playing” at being a vampire and actually believing oneself to be a member of the undead is crossed less frequently than some alarmists claim. Nonetheless, youth with emotional problems occasionally cross that line. Community services director Helen Carter states, “A lot of kids will do this, and they're just playing, but other kids get into it and lose their sense of reality… It can be just one of those adolescent things. But if you get a kid who has emotional problems involved, it can be deadly.”18
Rod Ferrell’s murderous vampire cult is an example of the danger of emotionally unstable youth dabbling in the occult. Carter claims that there are nine vampire cults in Arizona’s Paradise Valley. In most such groups a young adult is the leader, and followers are typically 14 to 18.19 A group in Arizona is led by a 20 year-old named Angel, who promises his followers will receive eternal life and unimaginable power, and follows an occult book called The Book of Nod (which allegedly describes the first vampires).20
Here, though I don't claim that this website is valid, since internet publications are not neccessarily truth.