Have a friend measure your shoulder width per one of the many road bike fit guides available on the web. This should give a base line to at least work from. I am your height and was just measured at the LBS to have a 45cm shoulder width. A wide but relatively short skeleton.

I got aa free full Serotta fitting as the LBS owners wife is in the process of learning how to do fitting and I was a volunteer victim;-) Serotta requires a fitter to do 10 fittings minimum to qualify for certification.