To make you feel a little better, I was a clumsy mess on my first bike, which was too big for me. Then I got one that was my size, and suddenly I could control it. However, while I can stand all day on my road bike (in general it's a much more intuitive ride once you get used to it), I am still incapable of unawkwardly standing on my hybrid, even though it fits me and I'm strong enough. Sometimes its just a bike geometry issue. Also these days I ride my hybrid more than my road bike (its my commuter) and I'm still sometimes awkward about signaling on it, if I'm going down a hill or something. I appreciate being able to hold the bars towards the center on my road bike, makes it much easier to take one hand off.
Also, FYI, I'm a 5'3" woman and I found better luck with Specialized brands vs. Trek -- they seemed to fit my small proportions better. My road bike is a Specialized Dolce. To be honest, being only 5'0", you're not gonna be able to find an appropriate road bike that fits you without the help of your LBS. I'd recommend starting at one that carries Specialized brands.