It's not just about your health and fitness anymore. Your class is counting on you to help them reach the next steps in their fitness journey. You can only help them do this by leading by example. A good instructor knows that their class is constantly watching them. Are you eating well? Tired? Fatigued? Gaining weight? Your class sees the answers to these questions just by looking at you. That's why it is important that you take care of yourself so you can take care of them.
Also don't just keep your class as a separate part of your life...engage them! Host functions outside of the gym. Get to know them for the unique people that they are.
Let your pride shine through and keep on dancing!