It is my belief that we all have a shadow side. We get the job of choosing which we want to feed: the light or the dark side of us.
NO one knows what causes vampirism. There are many theories out there, but no one knows for sure.
If your feeding on another's energies (preferably with consent or by feeding on crowd energy so as not to deplete any one person) makes you feel better then it
might be that you are one.
I keep saying this...and it isn't meant only for you but for anyone who reads this...don't let
anyone else tell you what you are. You must determine this for yourself.
There are some who are predators who will try and convince someone that they are something in order to manipulate them.
Please, if you run into that, run as fast as you can in the other direction.
Trust those whom earn it and not simply because they have a title or because they say they "know". Ok?
I mentioned shielding. It's still a very good thing to learn-for anyone.
Here is a site that has some good basic exercises:
http://www.psionguild.org/pshield.html