Our gut feelings usually guide us towards acts of compassion: no, it should not be considered as lying.
When we sense that we may hurt or inconvenience someone by admitting to our feeling, our intention should be our best guide. As an example, we meet someone who seems to have so many burdens of her/his own and she/he asks if everything is alright with us, it may be appropriate to say a noncomittal yes, to avoid adding further burdens to him or her.
If our basis of our conduct in life is putting easy-to-use labels on actions, in effect stereotyping them, it may be considered lying because you did not admit what you were feeling.
But if our basis of our conduct is our highest truth, which we could choose to be love, then by not admitting your feeling, you may then be considered compassionate instead of being labelled as lying.