I've found myself caught up in the craze to be incredibly fit. When I was in high school I struggled with this more than any other time in my life. I couldn't sit and watch a TV show without alternating between sit ups, crunches, and push ups. I stayed up late working out in my bedroom so that my family wouldn't tease me about it. I couldn't ever relax because I felt like I had to constantly be moving. My senior year of high school included cheerleading practice every day, a weight training class during the day, and then hours of exercise at home. It was too much.
Luckily I grew out of this in college after a very conscious effort on my part. Very few people know about this besides my husband but I feel like it is important enough to share with others.
Don't make yourself miserable! It is okay to indulge in something sweet. It is okay to choose a night in instead of every night at the gym. I definitely endorse a healthy diet and plenty of physical activity, but it is not worth making yourself miserable.