I think you know the answer but don't want to face up to it!
Bread and pizza go straight to fat. No valid nutrition in them either.
Be aware that exercise usually makes you hungry, and it's far easier to eat more, overall, when exercising.
So your weight is very likely to increase.
weight control is very tricky and I don't think anyone has it fully nutted out.
Just make sure that every meal is nutritious.
Avoid processed food, sugars of any type, refined carbs like bread, rice and pasta, soft drinks, alcohol.
Eat more protein and less carbs. Protein makes you feel full, whereas empty carbs put you onto the sugar highs and lows roller coaster. You get so hungry on a carb diet that you just have to eat something in a hurry!
That may be what you are experiencing. Try protein instead. Nuts and cheese, meat?
You can't avoid all of the foods that you are used to as you will probably start to crave them, but try to get to 80% good 20% not so good and see how you go.
Proper nutrition is the key.
Make sure you eat enough fats to as they are essential. Avoid highly processed oils like canola and margarine, use butter, olive oil or coconut oil instead.
Don't believe all of the cholesterol rubbish either.