For most people, "curvy" is reserved for the coke-bottle figure. Very slim girls CAN have it, but I think it's rare. Typically, "thick" on up to "bbw" legitimately falls into this category. Main requirement is a nice rack, smaller (proportionately) waist, and nice/roomy hips and ass.
Your body type is kind of "inbetween"... which can be a disadvantage when it comes to marketing yourself.
With your frame, you could easily work into the slim or "athletic" categories, though. It would require some effort, but you are not that far off.
(+1 on being a bad ass for putting this out there...)