It took us a long time to get overweight so its going to take a long time to take that weight off.
But here are some other reasons that MIGHT be at cause
Operating from an energy deficit.
With fewer calories coming in than going out the body starts holding on to fat as a way to protect itself. When there are not enough calories coming in, the body saves energy by reducing body temperature (slowing the metabolism), turning down digestive juices (making digestion weaker), reducing the pulse, and slowing thyroid function (resulting in less energy).
Not healthy enough.... yet.
As I said...things take time. You have probably been out of shape for a while so getting in shape will take time, then the pounds will fall off.
You’re eating food that exceeds your body’s current digestive capabilities....sos top it. Shoot for 1500 calories day and dramatically cut carbs and sugars.