I'm also single and have never enjoyed cooking. I lived on ready meals and snack foods for years - probably a big contributor to why I became diabetic. I was also a yo-yo dieter - and an ex smoker. Every time I quit smoking, I gained 20kgs and became prediabetic - finally diabetic after the last quit. I've gained and lost that same 20kgs quite a few times in my life - which probably did nothing good for my insulin resistance.
As a creature of habit who doesn't like to think about food all that much or to spend heaps of time preparing it, I've got a fairly easy to sustain routine now. I buy a dozen eggs a week, hard boil/peel them in advance and have 2 for breakfast each morning, along with about 30g pre-cooked cold meat like chicken, corned beef or sliced deli ham/turkey/chicken, half an avocado and a small piece of fruit like kiwi, mandarin, orange. I never have more than 10g carbs because breakfast spikes me more than any other meal.
I don't tend to eat a big lunch, mostly a full fat Greek yoghurt, a couple of slices of cheese, olives, a handful of macadamias or cashews, tinned mackerel/salmon, etc. Snacks tend to be a teaspoon or two of nut butter and coconut oil.
Every few weeks I buy a stack of pre-cut stir fry meat from the butchers (usually lamb, beef, pork, chicken) - I then split into freezer bags of around 100g or so and freeze, also a few salmon fillets. Then all I need to do add some oil, balsamic, mustard or whatever to the defrosted meat as a marinade and quickly stir fry. Make a quick salad or steam a few veggies and I'm good to go.
Boring you might think? I'm not bored yet...
I've been eating this way for months and it makes shopping a hell of a lot quicker when you shop the perimeter and I'm probably saving a fortune by skipping all the processed junk food. I think part of the key for me was to start thinking of food as nourishment and stop looking at it as entertainment or emotional solace or whatever.
I absolutely don't miss bread, biscuits, crisps, etc. I allow myself good dark chocolate, but mostly I'm not that fussed whether I have it or not. My usual dessert is about 100g of berries and double cream. And I've never felt in better physical health than I do now in my 61st year
IMO, when you start saying to yourself "they'll pry that <insert name of food you can't live without> from my dead fingers", then you've probably got an unhealthy, if not addictive, relationship to that food.