i did not expect 9 o'clock

I had this issue with produce. I stopped buying it because it would just go bad before I used it.

only buy stuff for what you want to eat? like if you plan on making burgers, buy the stuff. you don't need to plan for every day, because you're going to have left overs for the last two or so days.

Buy more fruit in summer and cereals in winter.

I suppose, if you're looking to make it more convenient, you could cook things in bulk and then freeze portions of it for later consumption.

Try going in with a recipe that you plan on making as soon as you get home, then the other stuff you buy should only be the stuff you know you'll actually eat or stuff that won't go bad. Of course there's the issue of having to buy more of a product than you need for the recipe, but that's hard to avoid.

If you need advice on how to better motivate yourself to make the choices you know you should make, I'm afraid I'm wholly unqualified to help.