I have a 22"X14"X9" carry on luggage which normally fits in domestic airlines. 

I checked the qatar airways and the dimensions they have listed is smaller than domestic. 

Will my carry on luggage fit in Qatar airways ?

Qatar airways dimension listed : 

One piece, not to exceed
7 kg and 50 x 37 x 25 cm which is equivalent to (19.68" X 14.5" X  9.84")

Any info would be appreaciated.

Thanks.

 Dont worry. Size and weight of hand carry luggage never matters, get assured.

 the size shouldnt matter if the bag doesnt look outragiously big and heavy. the smallest aircraft that qatar flies is airbus 320 but qatar doesnt not fly those planes on trans atlantic route. it flies wide body aircraft like boeing 777.

botoom line, your bag will definitely fit in the overhead bin but dont pack it too heavy or you might be subjected to weigh the bag.