Depending on portion sizes, I reckon there could be 4000 calories worth there, most of it coming from fat and sugar and cheap carbs (white flour.) There are roughly 1500 calories in a ten inch margarita pizza, for instance...a woman needs roughly 2000 calories per day and that's if she's very active!
Yesterday, I walked twelve miles, spent seven hours solid lifting heavy boxes and dragging pallets around, and cycled an eight mile commute. My Fitbit tells me I burned 2600 calories. If I ate like you I would be obese, despite being extremely active. That's the brutal truth I'm afraid!
No wonder you are putting on weight! You need to aim for a "budget" of 500 calories per meal for the foreseeable future. Breakfast: wholemeal toast, sugar free museli, eggs, porridge, yoghurt or fruit. Lunch or dinner should be a source of protein (eggs or meat) at every meal, accompanied by either salad or vegetables.
Cut out all sugar as far as possible. Strictly limit consumption of starchy carby foods like bread, pasta, rice and potatoes. No puddings except once a week. Above all, remove processed food from your diet and use "natural" substitutions: so not boxed cereal, oats instead: not Turkey twizzlers, chicken breast instead, etc.
Do not buy crisps and biscuits, full stop. Snacks should be fruit or nuts or yoghurt. No fizzy drinks or cordials, water only. Skimmed milk in tea or coffee.
Download Myfitnesspal and enter everything you ate yesterday...and I do mean everything, right down to butter, sugar in tea etc. You will be shocked I assure you! If you can, get a Fitbit or similar device. Compare how many calories you burn via Fitbit and contrast your intake on Myfitnesspal. Adjust what you eat accordingly.
It honestly is not that hard. Eat clean and natural and in the right quantities and you will feel better for it.