As for controlling/containing, it's just that I am emotionally expressive. Let's say that emotion dwells very close to my surface, and it belongs there. If I have to push it farther down, so it is hidden, I become uneasy and don't feel like myself. And yet, as I've gotten older, I've increasingly inhabited social environments where I must match the subdued tone around me, believing I need to push the emotions down to a more hidden place, and it's very difficult, painful, self-denying to do this.
I mean, I can do it--no problem there, it's acting! But to do it day after day, year after year? Then it's something more serious.
Therefore I say I can't control my emotions well, because especially if I am squelching them, they pop up here and there despite my efforts to deny them. And anyone here will likely say that I should NOT do this in the first place, and no doubt they are correct.