I have the same problem. I know what I NEED to do, but either can't make myself start or can't stick with it more than a week or so. I used to be better at it. However, I am trying to use social media and online support groups more to be motivated.
Also, instead of looking at women you wish you look at, maybe only find women's photos where they have posted their real before and after photos - that might be more motivating - where you can see what they were like before they reached that ideal weight or shape.
I've also heard the advice to find an activity you like. Unfortunately, my favorite "activities" are not very ACTIVE LOL. But, I do enjoy walking and playing with my dogs. So one thing I am going to do is be more active with my dogs. Especially one of them. She is high energy and needs the activity as much as I do. She loves to play chase with me and I need to NOT think about how I look running around, and just do it! Good luck!