Woah... I just re-read this after typing it on a bus ride home! There's a slight typo in my 3rd paragraph - I don't reject that, haha. Replace the word "reject" with "embrace", and it'll be correct.
And I appreciate all the constructive replies thus far.
As for waiting until August 1, I honestly just felt that picking a date in the future would help, so I couldn't just tell myself that 'quitting' was a spur-of-the-moment thing, and that I really was serious about it.