Try to eat the least-processed things you can. That means no fast food, instant meals, things with massively long ingredient lists, white things (rice, sugar), etc. Don’t bring it home from the grocery store in the first place.
This gets easier when you start looking into what’s actually in those things (the trans fats may be gone, but you don’t wanna know what’s left!), and as you get used to real food you will likely lose your taste for all but a few processed foods. I no longer think of these things as “food” but as either “treats” or “inedibles.”
Once you’re eating mostly natural things, and you avoid nasty highly-processed stuff, then (if you’re exercising), you can eat things you like, like fatty salad dressing, and reclaim cooking habits like frying (I only like tofu when it’s deep fried … I know, that’s bad, but my overall quite healthy eating habits make up for it.)
I know you don’t believe us, but brown rice actually is much nicer than white once you get used to it (as well as being more filling and chock-full of vitamins). When cooking it use about 2 and a quarter cups water to 1 cup rice, and add a pinch of saffron (if you can get it cheap), soup stock powder, curry powder, or something to flavour it, this can improve it immensely.
Find a way that you like fresh vegetables and eat them a lot. Be careful with fat, which does make veggies much tastier but should be used in moderation. Depending on your metabolism you can get away with a little fat if you’re eating lots and lots of veggies. About half of each meal should be fresh vegetables (remember they shrink when cooking, they should take up half your plate when fresh), so find a way you like them and eat them a lot.
You can get boxes of veggies delivered to your door. This way you always have some around and it’s (usually) organic and/or local produce, so you get more vitamin bang for your veggie buck, and it’s usually much tastier than supermarket produce so you’ll enjoy it more. (Try eating a carrot out of your garden, then a carrot from the grocery store. Same with salad greens.)
When planning your meals remember that a serving of meat is only the size of a deck of cards. You really don’t need much meat in your diet at all. You need veggies and whole grains in large quantities, and only a bit of protein. Focus your plans on the vegetables (ie “what kind of veggies do I want for dinner tonight?”) then plan the rest around that.
Let me know how you like your vegetables (and which vegetables) and I can provide some recipes, if you want. I got a million ways to cook greens. I love me some kale.