Showing Courage of a Vampire by Nancy T Lucas

Maggie moves to Richmond, VA, as a pre-med student and meets a strange group of kids at her college. They refer to themselves as "Vampire Groupies"; they file their canine teeth and drink fake blood. Maggie uses them to hide in plain sight (since she suspects herself to be a real vampire), and falls in love with the self-nicknamed Vlad, formerly known in the Richmond suburbs where he grew up as Larry Marker. However, Maggie becomes a victim herself when she falls into a sealed train tunnel on Church Hill; she hides her bodies in there and falls in with her latest victim. Unfortunately, she stabs herself with her own veterinary gun needle, bleeds out and wakes ten years later. To her horror, despite being in partial denial about her true nature for years, she awakens, has not physically aged, and most definitely a real vampire.