I had the same experience. I think exercise works for a lot of people, but not for everyone. The people who it does not work for het pressured into doing it anyway, which is harmful. In my case, my stress levels were consistently extreme and exercise would put it into an even higher zone where my body was unable to deal with it. All the pressuring me into exercising really harmed me. It took me years until a specialist explained this to me and all this time I felt like a failure and I tortured myself with exercise.