RobinW, lots of my friends are too shy to go to the gym, and just make excuses for not going. Just go, as SueW says, no-one will be very interested in you/what you're wearing/whatever size you are or anything.... most people are too busy with their own thing. I'm sure that they will have people there to show you how to use the equipment and plan a sensible workout for you, and then review it every few weeks or so, until you feel happy enough to get by on your own. Go for it, you will feel much better.