I didn't read all the responses, so forgive me if I repeat something that was said.
My boyfriend wasn't sure he would like riding a bike, and didn't want to go out and just buy a road bike immediately. So he would go and rent a road bike. After doing that for about a month, he knew he wanted to buy one.
Maybe you can try that route? Then you can find out if you like one for very little investment. Just keep in mind that once you buy your own bike it will probably be more comfortable, since it will be fit to you.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"