I tend not to cry. I also tend not to get overenthusiastic. But
  I do get sad and I do get enthusiastic. But I think that's my
  temperament; or perhaps it's self-control training. When I was
  little, I'd get VERY caught up in my emotions and it was hard to
  snap me out of them. I had biofeedback training to gain some
  sense of self-mastery over emotional excess.

  That doesn't mean emotions are wrong or bad to express; just
  that, for me, I rarely reach those levels. I don't feel stilted
  either and I encourage expression in others.