Oh no, I think you're allowed to wallow in self pity in that case!
And it's no problem, I'm awful at motivating myself sometimes but always feel so much better even just thinking about how I'm going to tackle the regular mountain of stuff to do!
Meal planning does save a lot of effort and wasted food if you manage to stick to it (which can be tricky sometimes). It depends a lot on how often you shop, and whether you tend to buy perishable items. If I was buying fresh veg and salad, I'd make sure that these were planned for early in the week. Sounds obvious, but I often find sad, past-it veg languishing at the bottom of the veg drawer!
If on day 1 you use 3 potatoes from a bag for jacket spuds, day 3 you could makes wedges from the remaining, with salad which would still be okay.
I've realised that there's no shame in frozen veg! If you eat things like rice and pasta a lot, then you just need to plan what you'll be putting with it. If you want to do a chicken pasta bake one evening, work out quantities before you go shopping.
I hope that helps, it's hard to explain without knowing what you tend to eat. Mine would go something like:
Monday: Stuffed jacket potatoes with salad
Tuesday: Spanish chicken casserole with veg
Wednesday: Fish bake with salad and potato wedges
Thursday: Chuck-it-in risotto with remaining fresh veg + some frozen
Friday: Pizza and salad
Saturday: Pasta bake
Sunday: Roast
Decide what you like and what you'll need for the week. If I haven't planned what to eat I often become disinterested and find it even harder to motivate myself! So I work out quantities before I go shopping. If meat is on offer I'll but the extra and freeze it, but will make a note of what I have in the freezer.
Also, and this may sound obvious, but shop and meal plan after you've eaten. I can become VERY enthusiastic about what to make for dinner when I'm hungry, which leads to more expenditure as I buy all those delicious deli counter things that I can't resist! My ideal meal would be a lot of wine and cheese ;)
Hope that helps :)