Hi, I am looking to purchase my first adult road bike. I am a woman, 5'0'' (short legs, 28" inseam) and fit. My boyfriend has a Cannondale and loves to cycle, and it would be great if I can go with him on his rides. I am comfortable on a bike, but have never had a real road bike. Since I'm a beginner, I don't want to spend more than $500. Does anything like this exist? I have heard that I should look for a used bike, but because I'm so short, I'm not sure I'll be able to find one in my area. Thanks for any advice!