[Serena Yuy]

It's perfectly normal. Considering your's was a simple occasion and theirs most likely were more formal. Like what others have been saying, for your vow renewal, do something more like what you may have dreamed to be your wedding.
Save up and make that the day that you've always wanted. Even though you already have one of the things you've wanted (the husband). That and you seemed to have had a wonderful time surrounded by people whom you love and love you. Which is one of the most important things about a wedding is sharing it with people you care about and want to share it with.