Jill, I think we can all relate to the fear and anxiety around attending your first AA meeting. Going alone is stressful, I know. But do keep in mind that AA is one of the most welcoming groups you'll find. I live in a large city and meeting "hop" often in order to find the groups that best fit me. So I'm often walking into a room for the first time. It's really rare that I feel less than 110% welcome. I went to a new meeting last week and I was barely in the door before people began coming up to me to say hello.
Also, a lot of cities and towns have Young Peoples meetings. Or perhaps a local college or technical school has an AA meeting? Then you're sure to meet people your age, too.