Psychic vampires are People that are born without enough personal energy, and some have spiritual damage that stops them from "recharging" naturally.
So, they instinctivly or intentionally Take energy from other sources. Some find themselves unable to take from anything but humanity, while others have trained themselves to drain energy from nature.
What you are Asking for, would be like asking if we could take calcium from your bones or iron from your blood, to Give you a difficiency. You are essentially Asking for spiritual Damage, and vampirism doesn't give long life or anything popular novels or movies Say it does.
Be content with being human, and if you feel discontent make something of your life to find peace. Wanting to be something "other" woln't fill anything.