I think I don't know how to eat

Just a pot shot from the outside, but sleeping 7-8 hours and waking up feeling exhausted, and being overweight....how about sleep apena? Ask your doctor...some folks it is night and day in energy and alertness having their apnea treated.

Post workout, a fat and a protein, such as some kind of meat and cheese, will help you continue to burn calories, repair your muscles from the workout faster and also helps to keep your blood sugar up, and takes longer to digest.

As other's have stated, perhaps your not getting a "good quality" of sleep. You can't rule out sleep apnea as a fat person's medical issue, as more often than not, it can be hereditary.

Low iron or zinc may be the issue too, have blood work done, you could be anemic and that causes lack of energy.

Try logging all your Carbs, proteins, fat, iron, sugar...etc. And especially, make sure you are getting sufficient fluids for the day. Not sodas....water. For every 1 soda you drink, you have to drink 1 8oz glass of water to replenish your body. Your body will go into starvation mode and you won't lose a pound, if it thinks it's not getting enough food for what you need.

Just a few thoughts. I cut out ALL breads, soda, white foods ( white rice, bread, pasta...etc) as they are very processed and cause bloating. I eat pretty clean, log all my food, fluids, and exercise, and cut my portions way down. I eat off a smaller plate/bowl, and set my eating utensil down between bites. It's alot of discipline and training yourself to do this.

Good luck

Although people always say "it doesn't matter what you eat, only how many calories you eat", that doesn't mean that eating "junk" food will result in you having enough energy throughout the day.

I didn't look at your diary to much, but eating things that are high in protein and fat will help you to have sustained energy. Carbs usually give more immediate energy that doesn't last. Eating a well balanced diet is important when it comes to your overall health, which is what seems to be giving you trouble right now.

I personally think you are probably eating enough calories, but perhaps if you mix up your diet a little bit you can find a combination of macronutrients that will help you feel better during the day.