I am shorter than you - 5' tall - but I am mostly leg. I have a Trek 1.2 that I bought today in the smallest size available - a 47 cm. The bike I had before was a 43 cm, but not Womens Specific and built very, very differently. You would be surprised what you can find in different brands. In some I was measured for, a 47 cm would have been far too big and in others it fit great. I would suggest getting fit and seeing what they have. I, too, share your woes. I went all over looking for this size and finally found one, so I bought it!