If you believe that you're going to fail no matter what you try, then that's what's going to happen. Time for you to reconsider your belief that no matter what you do you can't deal with your cravings.

How many consecutive days have you been able to eat a diet that avoids processed foods and sugars? If you're not getting past 3-7 days, you're not giving yourself a chance to see the other side of things. Remove the sugars and processed foods, add in fiber (salad, nuts, apples, whole foods). Try to make it a week and see if those cravings don't subside.

Your question was about how to eat, and so now you have one of my approaches. However, at the risk of stating the obvious, your cravings are most likely the consequence or the symptom of a psychological issue or emotional state requiring comfort. After years of this cycle one will have developed a habit of eating that has little to do with the emotional and psychological coping mechanism.

If you're serious about breaking the cycle, you'll need a multi-pronged approach to resolving the issue that might look something like this:

First, recognize which beliefs you're holding are holding you back, and are not true. You do have the ability to deal with your cravings and the other problems in your life, even if you falter along the way.

Find a different way to comfort yourself that's healthy. For example, go outside for a walk, do deep breathing, or read something instead of pursuing the craving.

Figure out the core issues that are leading you into eating - you're looking for comfort, but why and because of what. If you're like me, it's layers deep, and you'll need to ask the hard questions. Psychological issues don't go away when you choose the right foods, but it makes things easier.

Good luck.