Dilemma of Complaining

I always come across a dilemma when I have the urge to complain: should I do it? or should I reserve such thoughts to avoid being ungrateful? The emotional need to release one's worries is crucial in maintaining a healthy mental state; however, "indulging" in this activity too often leads to a realization that one indeed is not appreciative enough of current possessions. Once a path is chosen after such ambivalence comes the unsatisfying feelings. Feeling guilty of grumbling too much or feeling like you just locked your emotions in unwillingly. Perhaps acute judgment is required to balance these two components in our lives, but what exactly is balance? That lends itself to another dilemma. Hmm.