I don't like fish at all, but I wish I could be hypnotized into liking it -- I know how nutritious it is.
I don't like most fish either. I only like TWO fish, salmon, which is a fish most people who don't like "regular fish" because it tastes "fishy" like salmon.
I also like sea bass but it has to be steamed in a flavorful ginger-soy sauce. The sauce is what makes it.
I don't agree with the people who have said disguising foods in a sauce is a bad thing. I have news for them, most foods taste better with sauces & spices. That is what differentiates one dish from another. One chicken dish from another. The point is to find
healthy sauces and combine them with healthy ingredients.
What I have found is that I don't like how most people cook fish. It also has to be cooked in a certain way and within a certain time frame. Fresh fish actually shouldn't fishy. If it does, it's already old and starting to spoil. Fish is best cooked within a day of buying it. It has already been sitting for a while by the time it arrives to the store, unless you live at the coast.
Also, when cooking fish at home, it is SO easy to over-cook fish. Then it becomes dry, tough and flavor-less. Fish cooks really quickly and continues to cook from the residual heat, even after you've taken it off the stove or heat source. So, by the time you eat it, it's overcooked and yes, you won't like it.
Also, if the only tuna or salmon you've ever had is from a can, you have not had fish.
Same with veggies. I don't like how other people usually cook them. I have been finding ways to cook vegetables in ways
I like. I always try to slip them into flavorful sauces, like curry or low-fat stews.
Try to have vegetables in different ways. As Firedancer said, you probably haven't tried
every vegetable in a
variety of ways. You probably have tried a vegetable
once or twice and decided you didn't like it.
Sometimes, I have 6 different bottles of salad dressing in the fridge. I am also learning to make my own healthier dressings. Fresh dressings taste so much better!

It can really make a differece than the same old bottled dressing. I swap different dressings around all the time, so I never get tired of eating salads. Again, it's about finding
flavors you do like and mixing them around so you do not get tired. As someone mentioned, try substituting "spring mix" or mesculin salad for plain lettuce.
I have been trying to add beans into my diet as they are high in protein & fiber. It's been tough. I don't like how most people usually cook beans.
However, I DO like slipping chick peas or white beans in salads, hidden by a low-fat dressing.
I do make my own hummus from chick peas, so I can add my own spices.
Going on the idea that I love hummus and a mashed bean. I then found a white bean dip recipe that is very flavorful. OMG! It is now one of my favorite things to eat.

I nearly inhale the white beans, they are so well disguised by the spices.
Have you tried V-8 juice? One cup is a serving of vegetables right there. Even if you don't like it, you can force yourself to take 20 seconds to drink down one cup a day. Think of it as medicine. Or add some hot sauce to spice it up.
You mentioned you like tacos & sloppy joes. You can still have them (in moderation.) Substitute lean ground chicken or turkey. Also, learn how to make your own taco sauce & sloppy joe sauce. It will cut down on a lit of the fat, sugar, chemicals & preservatives in the canned and pre-seasoned mixes. There are even some recipes with V-8 juice. yo get your serving of veggies right there in your favorite foods.
You say you are short on time, but, if you have all the right ingredients at home, it might only take 10-15 minutes longer to cook healthier, using things like fresh tomatoes in tacos & sloppy joes sauce.
Same with homemade pizza. I make pita pizzas. Substituting stone ground whole wheat pitas for a white flour, thicker crust. I add slices of fresh tomatoes and low fat cheese.
Once you start adding fresh vegetables here and there, your tastes WILL acclimate. Then you start craving fresh vegetables- even cooked.
Right now, because you are diabetic, and probably was pre-diabetic for a long time before developing full diabetes, you crave sugary tasting foods and carbs. That's how diabetes works: you crave the very thing that is ultimately bad for you. You have to be aware of that.