Try to think about your fitness not as the workouts you do, but as the lifestyle you lead. Get active when you can so that getting to your favorite class will be an awesome bonus to your day or week, not something you’re relying on (ie. a source of stress!)!
This is the season for a lot of pressure to get your physical self "ready" for the beach vacations and pool parties and, while I am definitely on board for working toward whatever health and wellness goals you have, these sentiments are exactly what keeps us yo-yo-ing, feeling guilty, feeling like we're failing and all that other not-awesome stuff we feel about ourselves and our bodies.