I believe that every thing you do has an affect on how your life turns out to be. It might not always be even the big decisions that effect it, but also the smallest of things...
But I'm kind of a fatalist about dying I suppose... For example, if someone dies in a car crash I find myself thinking "if only he wouldn't have gotten in that car in the first place... but then again, probably it would've been something else then". So I strongly believe that your actions make your life the way it is, but I suppose I think that death is something that is pre-defined. Hmh.
A "funny" conversation I had with my mum when she called me to tell me that my uncle's wife had died of bone cancer:
Mum: "Sometimes God is so unfair!"
Laura: "Mum, you aren't religious, why do you always bring up God just in situations like that, it's got nothing to do with God's will."
M: "You're right, I've always been a satanist."
L: "MUM!!!

You're not a satanist!!!"
M: "No, I said a fatalist!"
L: "Oh, right, you scared me there for a second. I couldn't imagine you in a black rope sacrificing animals and burning candles..."