"Weight is not the issue, balance is.I amusse you can walk upright so you're already familiar with keeping your weight balanced (at least when you walk), so your body has already adapted to your particular weight level. Whew!Ok, the rest is all about practice. One suggestion that is used to teach kids to ride a bike is to lower the bike seat so that your feet can touch the ground while you're sitting on the seat (you can already raise it later when you've learned how to ride). Then practice (preferably on a very slight downhill) coasting on your bike (that is, get the bike moving with your feet, Flintstone's-style, and then lift your feet in the air). If you start to lose your balance, you can easily put your feet on the ground to regain balance.Once you've mastered sitting/balancing on a moving bike then you can start thinking about pedaling the bike. To keep yourself from feeling that you're going uncontrollably fast, I'd suggest you do this on a slight uphill.Yes, the faster you go, the easier it gets to balance your bike (thanks to the gyroscopic effect of the wheels). But if you're new to cycling, you'll probably feel out of control before your bike is moving fast enough to feel such an effect. Hence the recommendation to lower your seat and learn to balance yourself first.Finally, don't give up! Riding a bike is the most awesome feeling in the world. Not only is it good exercise and a brillant sport, but it's great form of transportation. I'm guessing that once you get hooked on cycling, you're days of being 193 will soon be over Good luck."