They love blood, are immortal, and are strongest at night, if they are not Vampires... Then what are they???

Its about a girl who's a nerd at school and gets bullied by this girl named Cierra. She has a bestfriend named Roc who is apart of a Gang and cant be around her only when his 4 friends aren't around (Prince,Prod,Ray&Diggy). She lives alone and at night works at at strip club to pay for her house and car.