If calorie counting and exercise aren’t working, it’s time to go to the doctor. You may have a hormonal imbalance or something. It affects more people then realize it.
Unfortunately, humans are terrible at these two basics. e.g. "it's just a cookie i'm having for a snack, that doesn't count, does it?" or "i walk up three flights of stairs to work every day, that's the same as 30 minutes of exercise a day, right?"