Yes you can! No matter what you weigh you can learn to normalize your weight permanently. What you need to understand is that this is not a "diet" but a lifestyle change and you will never go back to old eating habits as long as you want to keep your weight in check.

You will learn to eat a diet that correctly feeds your body. Food is your fuel and you will slowly learn not to have so much emotional attachment to your food. You will learn how re-program your thoughts. Most of us have been taught from little kids that food is your reward for everything and this creates an emotional attachment deeply rooted in childhood memories; it is a way many people maintain control and security.

Learn to eat food as your fuel. The food you eat becomes your body so pay attention to what you put in your mouth. You are the only one that that can put the food in your mouth and you should ask yourself if is worth the investment. Feeling guilty about something you just ate is worse than the food you just ate. Guilt creates a rise in your stress hormones which sets you up for insulin resistance which further drives your weight gain. So please no guilt trips! All you have to do is let it go and move on taking baby steps to better food choices.
Stress also plays a huge role in weight gain and so does the lack of sleep. Sleep is as important as exercise; you will learn to create the balance.

Learn how to balance your diet for your body type, your blood type, your genetic history, your personality and your exercise level. You will know your body fat percentage because it is more about fat loss than weight loss. You will learn how to eat the good fats because you need to eat fat to loose fat and the good fats are very important for hormone balance. Hormone balance is vital for weight loss. You will work on a regular work out program and with time you will be able to create a harmonious healthy lifestyle. Remember take baby steps in the beginning; one new change is better than none!