You'll find one! I'm not even quite 5'0" and have found comfort, hybrid, road and mountain bikes to fit me. Did I have to visit several bike shops? YOU BET! But it was worth it. Only once did I get on a bike that fit me right away, too - everything else needed to be tweaked a bit
I had to drive to a town about 50 miles away to find my road bike (and I'm in a large metro area, so there were lots of bike shops within 20 miles), so don't be afraid to call around and see what sizes they have in stock and drive a bit, it'll be worth it! Good luck!
Bicycling is the number one reason for the increase in the ranks of reckless girls who become outcast women" ....unknown 1895