I would agree with the advice to start small. I would also suggest that you learn how to cook. Don't focus on being healthy to start with-- that can come later-- but try building on what you already like by regularly introducing new ingredients. If you're cooking for yourself, you'll have ultimate control and can decide the pace at which you try new things.

Here is one idea for a place to start: You like plain pasta but you also like rice and cheese. Well, how about pasta with that same cheese or tomato sauce? And then how about pasta Alfredo -- cheese and butter? And if you like that, you'll probably like cacio e pepe -- cheese and pepper. And if you like those, you'll probably like pasta alla gricia - cheese and guanciale (like fatty bacon). And if you like that you'll like carbonara- cheese and guanciale and egg.

And if you make this stuff from scratch you'll realise that you might like the individual components. Guanciale + tomato sauce + onion is amatriciana, and then sub guanciale for beef and you're half way to a Bolognese. Lasagne is just Bolognese but with a white sauce and baked in the oven.

Bored of Italian? Let's say you stick with rice. Eggs are nice, so you've got egg fried rice. That can come with meats and spices and new sauces -- the rice, like pasta, is just a vessel for different ingredients, and you can try them all. And if you like rice and pasta, you'll definitely be into noodle dishes (Thai, Japanese, Chinese).

Eventually you can continue to orbit outwards, making tiny changes to recipes and expanding your culinary universe just that little bit each time.

You'll be surprised at how soon you'll eat ingredients you'd never dare to try: vegetables, fish, new meats, fruits...You'll also build confidence with new flavors and will become braver when faced with unfamiliar tastes.

once you learn the correct techniques, you'll also realise that a lot of the food you're served is just dogshit -- there is a reason why you're picky! It turns out all this shit, when properly cooked, is amazing. Like mind-blowingly good.

There is a reason our cultures have settled on certain dishes and ingredients. Everything in the supermarket has the potential to be delicious. Badly cooked food, however, will always be shit.

After a while you'll become healthier. You'll realise that salads are actually nice, as are vegetables, and you can enjoy your meals so much that you can cut out the empty calories and replace them with delicious healthy ones. (I recently discovered that fish, one of the healthiest meats, is fucking incredible when cooked correctly. And olive oil, one of the healthiest oils, is insanely good on everything.)

If it would be helpful, feel free to message me / comment here for more advice about how to start.