How to make yourself shop? Figure out that one item that you will miss enough to go out for and always buy just enough for the week, even if it's on sale. In my house it is chocolate soy milk- if we are out of that my kids give me grief until I get off my duff and do the shopping.

On the produce issue- the best way to make sure you eat all the fresh veggies/fruits you buy is to do the prep work on them right after you get back from the store- wash and cut it all so that eating or cooking it requires no effort. Then they will be just as easy to eat as prepared foods or snacks.