The problem is that you're trying a bunch of fad diets.
Weight loss is deceptively simple. Take in less calories per day than you burn, and you will lose weight. That's it. "Types" of calories is important too but is focused on too much. Exercise is very important, but trying to lose weight via exercise is ridiculous. It's much easier to just not intake those calories in the first place.
There are calculators that will help you to figure your BMR (basal metabolic rate) which will allow you to figure out the corresponding amount of caloric intake you can have that will allow you to have a net caloric "loss".
Actually putting this into practice does involve meticulous calorie counting and very probably feeling hungry a lot of the time, as you are used to a higher caloric intake; that is where the "deceptive" bit comes in.
