First of all... welcome ShadowLurker. This is not a fairy tale roleplay site. I'd suggest you start reading more about energy vampirism from such sites as
http://psychicvampire.org/index.htm and even some of the articles here on the site to learn more.
Actually, Lost Darkkin, not all vampires were born that way...
There are some vampires who became that way from having their chakras damaged from extreme injuries. I think I am one of those vampires who were 'turned' into one. It was due to a car running over me when I was 5 years old and since then I've had vampirism. The car ran over my heart chakra which I've heard is the most common chakra for vamps to have a disorder with...
To this day the left side of my body tends to not grow as big or long as my right side of my body. My left leg and arm is shorter than my right and there is a somewhat visible difference between the sizes of my left and right hand as well.
Of course the person who ran me over didn't even have to pay for the years of chiropractic care and the lift in my shoes because she was related to a cop who knew how to cheat the system... If she wasn't going 30 miles per hour in a 5 mph parking lot MAYBE she would have friggen SEEN me instead of just turning those corners with screetching tires! I honestly wasn't stupid when I was a kid... I knew to be careful and all that but she was going so fast I couldn't get out of the way in time...
Although I should mention that when I was ran over it was over my heart and stomach areas that were squished and somehow I was able to jump up immediately and tell my wide eyed mother that I was ok... she replied "Well I'm not ok and we are going to the hospital now!" and then she ran me over there and the doctors sad I was fine too XD except when my leg got burned from the tailpipe :s just had to scrub it for a month and it was all good...
Wow sorry for the wall of text about my own life O_O;;; I was just trying to explain where I got my energy disorder from.