There's this American movie made in 2005-2010 I don't know what year but there was a movie where there the whole planet turned into vampires and they had to drink human blood to survive and the human population was decreasing and there was a guy in the movie who wanted to change back into a human and he did at the end. Does anyone know what movie I'm talking about?

"Daybreakers"

Sounds like, Daybreakers