You can NOT get fitted for a bike on the internet. Only by going to two or three good shops, and letting the staff fit you. However, most store staff assume that younger riders want a low, aggressive position on the bike, and fit customers on the smallest size that will fit.

I prefer a "heads up" position, as I ride in heavy inner city motor traffic. So, I prefer the tallest frame I can ride. So, when I am looking at a bike, I stand over the bike flat-footed, with my belt buckle about two inches behind the stem. It is okay if the top bar is lightly brushes against my jeans, but if the top bar is pressing into my crotch, that bike is too big. If there is more than an inch of daylight between the top tube and my jeans, that bike is too small.

Visit shops, take test rides. Don't ever buy a bike solely based on what you read on the internet.