Hey, "FatAndFrustrated"
Firstly, really sorry you are feeling so low in terms of how you feel about yourself. It's hard to even say it online when you feel like that.
So much of what you say resonates with me in terms of approach to weightloss.
I was not as big as you and I don't have your other physical challenges, but it took me a year to address the fact that I was several stone overweight...and counting.
And it took a change in mindset, as you have recognised.
Also, I didn't tell a soul I was on a mission - couldn't have stood any f***g comment about 'ooh, should you be eating that' or 'I thought you were on a diet' etc. And I didn't want to be under pressure.
So - because of the avoidance of pressure, I went for a very slow and steady approach. It has been about 550g a week, sometimes less. It doesn't matter. I visualise any loss as a pack of butter gone from my middle. Or 2 packs, or half a pack - everything counts.
Likewise food - I enjoy food. I enjoy looking at recipes and planning nice meals, I didn't want to adopt any out of the way diet or eating pattern.
Exercise: I was very dubious about my knees, can't keep up with dance or Zumba moves, and am a very amateur swimmer with bad technique. However, while the pools were open I started swimming regularly, slowly up and down, on my back, breast stroke, and used it for my mental well being - but I noticed an increase in fitness and tone after a few weeks.
When the pools closed, I started walking, increasing my walks, and again, using them to visit different parks or neighbourhoods, and have been increasing the distance. I start out as briskly as possible, but then just walk at whatever pace I fancy. I am not nearly as tired now after really long walks, as I was when I started out.
Food: before I always saw losing weight as a chore and a dull burden. And on at which I risked failure. So I just decided to invest in my health. Eat nice food, good food - but healthy food. Cut out snacking (except for things that I set up for myself that I like - a few excellent olives, carrot sticks, frozen cherries with a spoon of yogurt, a small mug of cocoa (not hot choc) with semi-skim milk and a teeny amount of sugar, a 100Cal portion of good brie with one lovely sourdough cracker.....
Nice meals - but easy on the portions of rice, pasta etc, and look for non-fried recipes. Using lots of spices and flavours.
Nice healthy food as a pleasure to look forward to, rather than a chore.
MN: I joined some really friendly non-judgey threads, where 'slow and steady' 'normal healthy food, not diet regimes' have been the norm. The 1lb a week thread is a good example.
Success and achievement: I allowed myself to be fuelled by my success - and every half pack of butter was a success. I can't work with 'rewards' for myself because I want the success to be its own reward and not risk 'failing' to make a reward, iyswim.
Sorry for the long post. Good Luck!
You are very definitely not useless.