existentialism vs nihilism

[Fat_Hippo]

Huh, by that definition I'm most definitley an existentialist. Don't believe in god or any pre-ordained purpose, but don't think that means I should just torment the shit out of everybody just for the fun of it.
Great, now I already know that I'm an atheist and an existentialist. Any more ways I could classify myself?

What are people called who don't believe in destiny but in decisions and luck?