First off, congratulations on your fabulous weight loss - you look smokin' hot in your photo!
I have struggled with my weight my entire life. When my son was about a year old, I lost about 40 lbs. and was down to 132 lbs. at 5'6". (And what I wouldn't give to have to lose only 40 lbs. now!

) I was a size 8, but I was still surprised to be considered "thin."
I remember this one time when I ran to the grocery store from work to pick up an apple because I didn't have any fruit in the house to put with my sandwich I'd packed for lunch. An older woman in line looked at me and said, "Please tell me that's not the only thing you're eating today - you already have such a beautiful figure!" It floored me - not because it was a bit rude and none of her business what I was eating, but because she referred to me as having a beautiful figure.
Another time, I was on reserve duty away from home and a girl and I were discussing the difficulties of staying within physical fitness (read: weight) regs and a guy looked at me and said, "Wow, I can't even picture you as overweight." I was like, 'is he talking to me?'
I don't know when we finally see ourselves as thin. It's a weird brain/body dynamic.