A quasi-related 20-point true/false test to introversion/extroversion known as the "locus of control" i.e. how we let internal or external factors/phenomena affect our life's choices/successes.

More info @ Wikipedia.

FYI I scored 65 where 65-80 approximates with "Internal locus of control".

In conclusion I would agree that for me personally things like "luck" and "chance" will not primarily direct my successes in life but rather self-motivated conscious effort from within thus my fate would seem accountable to my self. Afterall, a little bit of "luck" and "chance" would likely stem from an initial action from my self.