There are several 论坛 posts and opinions voiced 由 people who have claimed to be real vampires. I hate to be the one to tell 你 this, but 你 are not a real vampire. Or, at least, 你 are not a vampire in the sense of mythology (which includes Twilight).
Biologically, 你 are a human. 你 cannot ever change that, sorry. This is because there is no other humanoid species in existence today other than Homo sapiens. The closest a human being can come to a "vampire" is forcing themselves to drink blood, which is a very bad idea (I'll get to why later).