Had to go for "don't know"

I've been interested in Russian culture for as long as I can remember (even before I knew the meaning of the world "culture", I guess ), but I have never done any formal studies of the language. I just keep toying with it... then I decide I don't have the time to do it properly anyway, and try to run away. But it just keeps coming back

And to my great surprise, I actually understand a whole lot more than I think I do. Unfortunately, my knowledge is mainly passive.