You definitely are not the only one who doesn't cab count, there are many diabetics who are still on twice daily injections and don't, and many like you, who are on MDI and don't....
For me personally, I was introduced to MDI alongside carb counting, so the two go hand in hand for me, but they do actually work well together, one is designed for another, and its worthwhile learning.....
I have been doing it now for 3 years and so I dont actually look at the back of packaging anymore, its all a well educated guess, bag of crisps 15g, slice of bread 20g, 300g of fried rice 70g. Its all assimilated over time and it becomes really easy....
your living arrangements will change in time and you may feel you need to start carb counting, or that it will become easier if your on your own/with partner.
At the moment, it seems you are not having any problems with your diabetes which is good, as long as you know you may need to start tightening things up as the years go bye and the diabetes has had time to do damage.
I need to keep things as tight as I can, I don't, but I do a good enough job for the moment, minor retinopathy/maculopathy and elevated BP is all I am battling at the moment, but no doubt these will deteriorate in time.
When the time is right, take the next step........
