Don't totally discount hybrids if you like them. I ride a 17 step through hybrid with 700mm tyres no problem and I am only 5 ft tall - and my legs are short. Also try specialized bikes- they do a great range and come in lots of sizes. As people have said you do need to try the bikes out though. I am looking to replace my old hybrid and have been trying out various bikes. With the specialized sirrus I was more comfortable on the men's medium than on the extra small - which per the catalogue should have been perfect for me. Good luck - I know it is difficult when you are below average height but you will find the right bike if you keep looking - honest !!
Enjoy your riding.