Cross-dressing seems to imply a disconnect - a crossing of sorts - between your sex or gender (depending on where you choose to measure from) and the clothes you wear (which are themselves subject to gender stereotyping - e.g., skirts may be appropriate for men in one country or time period but not in another).
In a purely factual sense, I suppose that what I do isn't technically incompatible with the term "cross-dressing", especially if you believe the fact that I have a penis makes me male. But when I dress as a girl, it's not so much a costume I put on - which is why I shun the label "drag" - so much as it is just the clothes I relate to and feel more comfortable in.
"How you holdin' up, Stewie?"
"Umm... I feel right, Brian. I feel right."
Which, I guess, reflects my transgender feelings. It's not just the clothes of the female gender that I assimilate, it's the whole appearance (even to the point of grooming my body in such a way) and the mannerisms and personality. And it's something I prefer to do on a regular, day-to-day basis - and not exclusively for sexual stimulation - that rather than putting on a mask as for a performance, it's like I'm showing my true face instead.
So when you ask if I am a cross-dresser, the answer is really yes and no, depending on what you mean.