Skittles, what are some other foods you DO like? I think there's usually a healthier alternative to most foods... that might be an easier approach than trying to force yourself to like foods that you hate.
For example, if you love french fries, you could try making baked french fries instead. I tried one recipe where you put strips of potato in a bag with egg whites and shake it, then put the strips on a pan with salt and a little olive oil and bake it. It's not quite as good as french fries, but it's still good- and much healthier!
If Skittles were one of your junk foods, maybe you'd like fruit leather? Target has the Archer Farms brand and I've also seen the Stretch Island brand at some Walmarts. Fruit leather is made of concentrated fruit puree instead of corn syrup like most candies. I used to be a junkie for fruity candy, but fruit leather took its place.
I second the person who suggested the microwaveable bags of veggies- veggies can be a pain to prepare when you're busy, but you can find packages with sauces and seasoning already in the bag. Cooked veggies are probably easier to get used to than raw ones if you're not a veggie person.
Good luck with your goals!