Shalom Naemanson,
I sympathize and empathize (I should say sympathighs). I have been fat my entire adult life. I know how dificult it is to start and maintain a diet. I know what inertia is and I share your reluctance to excersise. But, I also know that you have taken the first, and most vital, step toward recovery. You have not accepted your condition as inevitable and irreversable. Your next step must be motivated obsession based, if at all possible, on desparation. A lifetime of habitual overeating is a formidable foe. You'll have to fight it with an extremism of will. Sometimes, fear is a useful tool.
Three months ago, my doctor told me that my blood sugar level had climbed into the dibetic range. Well, that scared the shit out of me and I started a Weight Watchers regimen and lost about 25 pounds in the first six weeks. That brought my sugar count down to normal but I didn't stop at that. I realized that the threat of diabetes had driven me to do what I always knew I should be doing, so I decided to avoid the threat by losing another 70 pounds and getting so damned healthy that I'll never die. I really believe that I am in charge of my life and death now and that feeling is empowering and enabling.
(I have dropped an additional 18 pounds and, I hasten to add, six inches from my waistline). I know that everyone is different but I hope my success helps you in your quest. Good luck.