Hi! My name is Lisa and I want to get into cycling. I want to find a decent road bike, but I wonder if I'm too heavy or what not. I've been losing weight and running and swimming, but still uncomfortably close to 300lbs. I'm also short 5'4". I've been to a reputable bike shop, but couldn't find a bike that I could stand over and put my feet on the ground. The shortest I found was 44 cm.