You sound like I used to be.
I tried the low carb, high fat, and it didn't work.
Short term diets didn't, I needed to change what I ate entirely.
The following worked for me, and I reckon I can sustain it as a lifestyle now.
So my recommendations are:
Count calories instead, to give an idea of what to eat in the day.
Now I have a good idea what quantity I can have, and what is in each food, I don't quite as much, but originally I aimed for 800 to 1200 calories a day, and interneted everything.
You don't need a scale for porridge, pour it into a cup, a glass, anything that you find gives you a reasonable portion, and you can repeat it. If you think it looks too much, it is, put less out next time.
I also remember student food, and student money.
Cut down on the beer, switch to Coors Light for when you can't, then make it last.
Buy veg, ideally the reduced ones but before they become a mulch. Don't buy meat, and if you do, buy fish, or chicken breast occasionally.
Dry fry in the wok, add a lot of curry powder, or chili. (Buy dry spices if you can, avoid garlic paste if it's oil based. Avoid pre made jars of cook in sauces. But use them when you need a quick meal, just check the ingredients, and the calories).
Chuck in the economy kidney beans, or the chick peas. Serve it with a ladle, and count the number you put in to your dish. Hold off the rice and pasta.
Bulk up with mushrooms.
I did try the cauliflower rice and courgette pasta, and it does work.
However I found just chucking it into the pot chopped worked as well, and took no time.
And any left over veg, put in a liquidiser with a tin of economy tomatoes, add chili to taste, and you get a very nice soup in two minutes. Freeze everything you don't eat, in single portion sizes.
Look at
http://www.snack-girl.com/ for snacks you can eat.
Change what you eat, and cut down portion sizes slowly, (spices really help, as the hotter it is, the less you eat, and you can drink water with a hot chili or curry, as you can't even taste the drink).
Chuck out butter, fat, oil.
Chuck out pasta, rice, potatoes.
Eat salad, peppers, fruit, at lunch.
If you have to buy a sandwich, get one with the green indicators, or if you go to KFC, get the salad with no dressing.
Eat little and often, as opposed to waiting until you are feeling starved, then gorging out. It's easier to learn to skip a snack later.
Cook from scratch, eat the same thing three days running if you like it, (or you've made a huge pot full, experiment, and if it's really disgusting, add a scotch bonnet chilli.
Then you can survive on a student budget, and not spend more than a few minutes in the kitchen. (Unless you want to)
Try it for a while, if it doesn't work for you, at least it's been fairly healthy, but move on and try again until you do find one that works
But mainly, enjoy food.