I don't think you are weird at all. I am shy too and can relate to not feeling comfortable in new situations or with people I don't know. I wouldn't worry too much about your age I don't think most quilters I've met care much about how old you are. Do you have any kind of sit and sew at a nearby quilt shop you could go to that would be for just a few hours but where you might meet some other quilters? Maybe you could start with a shorter retreat and bring several projects so you could keep really busy if you felt uncomfortable with the others and at the very least you would have some completed projects and at best might make some new friends.