This is so hard. I'm almost 3 years out. I've lost 150 pounds. Yet, there are some days, I pull my clothes out of the closet, look at them and go - that can't be mine, it's too small. I consistently go to the wrong size racks in stores. My head says I'm still 300 pounds.
When I see photos - then vs. now type things, I see it. But, when I look in the mirror, I still see the fat girl.
FWIW, I'm an avid athlete now and work out almost daily. I'm ranked in the top 25 of my sport for my age group in the US. I work with a personal trainer and I can deadlift 235 pounds and squat 225. Yet, I still see myself as a size 26 and not a size 6.
The head is the last thing to get on board.