Could I have been born a vampire?

No. First of all, there is no such thing. Even mythical Vampires are made , not born. Vampirism is a mental illness, ora sexual fetish, where the biting substitutes for sex. Vampires cannot reproduce sexually.You're just hitting puberty with an over-active imagination. Stop watching all those vampire movies and TV shows. I promise you, there is no possible way to be born or grow into a vampire.