I know the feeling, though I haven't lost as much weight as you. I've lost about one and a half sizes since I started dieting/exercising, but I still see "fat" when I look in the mirror, and all I can think about is that I still have almost 30 more lbs to go before I will be at my goal weight. Today I had a momentary panic when I saw stretch marks on my stomach (I think from losing weight), and was suddenly like "oh no, I will look thinner and better, but underneath it will still be yucky!"
My suggestion is to put on some clothes that used to fit you. The two things that really make me feel like I'm making progress, and I'm not fat, are wearing my older clothes and seeing how my pants are basically falling off, or putting on clothes that I bought back when I weighed less, and seeing that they almost fit right again.
You might want to try taking a picture of yourself, and comparing it against old pictures from when you weighed more. Or another possibility (if it is the type of thing that suits you) is to indulge in a visit to a day spa or something really pampering, where you can do something really nice for your body.
I hope that's useful! Congratulations on how much weight you've lost so far! That's really amazing.