I wouldn't feel comfortable riding that kind of bike. For me, it's very important that I'm able to comfortably touch the ground with my feet, because I depend on that during emergencies or at least during occasions that I would need to catch my balance. Road biking is much much more challenging than biking in a park or let's say a biking path. You are also applying a good level of reflex reaction when biking together with other vehicles. If you can't personally control your bike because you are having difficulty reaching the ground, then it's totally unsafe to use it. It's a waste not to be able to use it, but think of your safety first and there's no such thing as a waste when you are protecting your safety.