You have to dedicate yourself, there is no way around it. No magic motivation or special solution, just white knuckled commitment until it becomes habit again, then an iron clad will to correct when you slip, always move forward, and never EVER give up.
When yore mentally and emotionally ready you CAN do this. It is never too late. But being fed up isn't enough. Hating the fat isn't enough. You have to be ready to change fundamentals about your choices and lifestyle that aid you in moving toward you goals, not away from them. And that can be the challenge. I wasn't ready to do it for 22 years of life. Then when I was, there was no quitting and no turning back.
You don't lose large amounts of weight through perfection - I've had horrible days, binges, maintenance breaks galore and even lazy regain times when I have to catch myself and correct back on course. Two babies in this journey so far, as well. If it took perfect adherence to lose weight I'd have failed spectacularly. But it doesn't perfection, it takes perseverence.
You can do it, when you're ready. And we'll be cheering for you