I think I am fatter than I have ever been, and I have always been a fat git, right from primary school. I have had a few spells in the intervening half-century when I have not been overweight, but they have been few and far between, most notably when I lost 3 stone in 3 weeks when I contracted mumps as a 29-year-old. When I returned to teaching after those 3 weeks of absence the kids gave me a new epithet: "Skinny".
It is now at the serious stage in which I have to consider one stark fact: a 61-year-old morbidly obese bloke is doing his chances of reaching 70 no good at all.
You may look at the see-saw that is me and my weight and wonder who am I to lecture, but here goes anyhow.
I used to use a line in jest: "I come from a long line of fat gits, my dad was a fat git and his dad before him". Which, in itself stands true, but is a singularly unhelpful self image. Over the years it became less and less funny, as the weight crept upwards. Dieting was not helping me at all. I finally came up with a strategy, a version of what I used when I went from being an 80 a day smoker to a non-smoker. It still helps me to lose weight easily. What I did was to change that visualisation, and stop thinking of myself as a fat git, regardless of the physical evidence. Instead I think of myself as a thin person, doing and eating what thin people do. I find it very powerful indeed, there is no need to calorie count, no need to abstain from any food/s (this system works very well with Paul McKenna's "I can make you thin"). As it happens, I do abstain from alcohol most times, because I find that weakens my resolution such that it all goes to pot, but I still have a drink now and then.
Don't know if it would help you, but happy to chat if it would help.