It took me a while for my mental image of self to catch up with the reality. But - that's the good thing about losing weight slowly; it gives our brains time to adjust to our changing bodies. I couldn't see it for a while either, but eventually...yes. Now, I'm astonished when I look in the mirror...who is that hot-looking chick?
People often see the change before I do. Lately, people are bugging me hard about how good I look/how slim. When this happens,I realize that means one of two things: one, that my behavior has changed again/positively (i.e. I'm more confident, happier, and outgoing that I used to be, and it's obvious), or two, that my body shape is subtly shifting again, and though I can't see it yet, others CAN, esp. because there's a lot of people who care about me closely watching my journey and my changes, physical and mental.
Give yourself time...study yourself in the mirror. Get to know the new, slimmer you. Talk to yourself - positively. Tell yourself how beautiful, hot, thin, incredible, strong you are...while looking in your eyes in the mirror.
And thank people and smile when they tell you how good you look. Repeat what they said to yourself while studying yourself in the mirror.
Your self-perception will slowly shift. Hang in there!