Get one and spend some time making it comfortable for you, a reputable shop will adjust the bike and swap out seats, bars, etc., til it is right. Then, go slow til you get used to the motor on different surfaces. Sounds like a fat tire bike might be fun for you and a bit more stable. Buy from a reputable shop that also has a bike fitter and they can even help you with the leg length discrepancy - there are things that can be done so it's not an issue when you ride.