Typical Malaysian diet full of carbs that's why all skinny fat. Need to start balance your diet with more protein & healthy fat. Can supplement with whey protein but preferable solid food source from various source such as meat, egg, milk, tofu, etc.

The minor result is just pumped muscle which will go away. Your muscle tend to 'swell' when you push them. Its all water and blood. If you don't eat at calorie surplus then muscle don't grow. Eating at surplus also means you will gain more fat.

You don't gain muscle & lose fat at the same time so if you're not confidence with your current look then your best bet is calorie deficit to burn fat first. Not sure how big is your tummy; i guess its pretty much water retention from your diet, sugary drink, sodium, etc.

If i were you. I would start getting proactive first by going for morning walk/jog, badminton, swim or hiking. Go to gym and hit the weights to progressively overload then finish off with cardio. Gradually change my diet to more clean and more proteins/healthy fats. Lastly, i will make sure to get enough sleep, reduce stress and listen to my body making sure it can recover well.

Its not the food being shitty. Its your pick. Now you can try to pick 50/50 protein and carb.

Depends on how much protein you need for the day then only can count how many egg whites you need. U calculate by taking your bodyweight in KG x 1.6 ..

If tummy not that big then as what i said, mostly water retention from your diet. Don't cut down calories. Just add more activities.