You are still young! Remove the bad food (ready-made dishes and snacks between meals).
Learn to salt a little,not too much, your arteries and your kidneys will thank you later.
If you are hungry, start by drinking a LARGE glass of water (never soda, it is poison), and always have raw vegetables to chew in the fridge (small tomatoes, radishes, small pieces of carrots, cucumber , Nature, it is better) and you will find the taste of things simple but good.
Learn to cook vegetables (fresh or frozen) with herbs (parsley, basil, chives, etc.) and add spices (curry, curcuma, ras-el-hanout, piment, etc.).
Well, not ALL at the same time ...
100grs of starch, and 150 grs of vegetables, with 100grs (eggs, meat or fish), a little cheese, not too much, and a fruit!
One meal a week, friends, restaurant, to have fun with a good dessert and good wine
( a little ! )
Enjoy your meal !