I can't do this anymore

Honey , you can totally do this , you might have done bad on certain days , and that's ok, wrap your head around that idea. It's fine to have some day when you eat more/ crave more, go over the calorie intake, we're all human , make sure you make small steps every day for long time goal - this is after all a complete lifestyle change for most people.
- agree with 80% food , 20% workout , if you had a big lunch , don't feel bad , write it down calculate calorie intake and don't wait for tomorrow to lower ci, what's wrong with dinner , no point in postponing anything, you're doing this for yourself , no point on cheating on yourself
- if you can't go to the gym , that's ok , workout at home, with or without equipment. find a hobby that you like, when workouts are fun , they're easy to stick to. and try some new workouts every once in a while, try fast walking around the house, build up to running , try zumba / yoga / karate / boxing any other kind of workout , you might grow to like them in the end
- the basic thing to remember is : keep reminding yourself as often as possible why you want this because you probably don't want this just out of boredom. you want it for a reason.