To dream of a vampire is a representation of many things. It represents your sexual nature as well as death and fear. It combines civility with violence. Consider who in your life wears these two faces.
Someone in your waking life, who possesses a great deal of charm, may eventually turn hurtful and violent towards you and your feelings. You are most likely very aware of this possibility, but feel you cannot help but spend time with them. Vampires may also be a physical representation of the decision to have sex for the first time. Conversely, the vampire may indicate that you are exhausted, whether physically or emotionally, in your waking life. Otherwise, you may suffer from a debilitating addiction to alcohol, drugs, or sex.
To dream that you yourself are a vampire represents how you use those around you. You are using everything you have to further your own goals.