Interestingly enough, I am actually rather a happy-go-lucky slacker.
My determination mostly has come out of necessity, rather than as a natural tendency. I know from experience that nothing comes from my just sitting around and thinking about things; I have to step up and make things happen. And once I am "a body in motion" I tend to continue being a body in motion... otherwise it feels like all the previous effort was just wasted.
Congrats on having a successful month!