I find it distressing to believe in some destiny or fate. I don't like the idea that my future isn't in my own hands, no matter how badly I bungle it. I want my mistakes to be mine, and my victories to be my own. Perhaps it's pride, perhaps fear of the unknown, but I don't like the idea of determinism.
Even if our actions are based on prior decisions, we can still choose to ignore those influences. Like trying something new.