It's impossible. vampiros are complete myth. People who think otherwise are completely messed in the head.
Even if they were real (Though they ARE NOT)I don't see the fun in being one. Living forever is eternal despair. There is nothing cool o fun about it. Living while the ones tu care about get old and die right in front of you. Hunting is the only thing tu can do; tu don't even have the pleasures of enjoying the simple things: Food, water, sunlight, and being around others. It will slowly drive anything mad.
It's a stupid thing to want to become. But really, vampires do not exist.
Stay in school and build a life. All tu can do is look forward.