So, I got my first red countered, and then got invaded after I took my blue.
Well, losing red was my own fault, since I smited -way- too early. I get antsy.
Anyway, despite Lee being two levels up on me in the early-to-mid game, I stuck with it, taking advantages where I could. In the end, through sheer will and determination, our team pulled through and won. Those teamfights were pretty good in our favour.
I guess the moral of the story is "never give up".