Hi Martha, hello and welcome to 3FC!

You'll find all the support and encouragement you need here, and some great advice and success stories. We have support groups for all age groups, all diet types, and I recommend having a look through all the 'goal!' success stories, they're very inspiring!
As for working out in front of people, it's nowhere near as scary as you think, trust me. No one that goes to a gym goes there to look at other people. All kinds of shapes, sizes and ages go to gyms these days, and they probbly have the same if not more insecurities. You go in there and you focus on what's important - making your body healthy.
Good luck and have fun around the boards!