I don't think it's because of the things I do that I have a personality...
I think I do things because of my personality...
(do you avoid working because you are lazy or you are lazy because you avoid working, when you look at it simply both means the same thing, but when you think, determine the order of things and why you do these actions, the second answer "What you do is defined by who you are." seem to be more correct)
Another example, you may save someone because you're kind, but it's only the other people's opinion about you that will change once that happen, your personality itself won't change because you saved someone unless it was in some f*cked up setting in which case it would be a trauma...
Anyway this is a rather phylosophical question and it's pretty hard for me to explain what I'm trying to say because well... english is not my first language and that's all pretty complex stuff... the best I could do was to give you those example to try and understand by yourself xD
