Playbook: The Vampire (PBtA)
To a point¸ they're right: you need to drink blood in order to stave off the thirst¸ and the longer you go without sating it the more you can feel it gnawing at you. And if you don't feed by choice? Eventually something else will take over and make you.
This new (un)life does have it's upsides: you're stronger and faster than the normal human¸ your sense of sight and smell are greatly enhanced¸ you don't need to eat or sleep¸ and can withstand a staggering amount of punishment without dying.
Maybe it's not all that bad.