I think when we are overweight, we tend to numb outselves to the mirror - after all if we took a close look at all the bulk, I think we would just spend the day on the floor crying!!
You are finally allowing yourself to view you as a "person". You have a shape, a style, etc. You probably arent' hiding under oversized shirts anymore and avoiding clothes shopping because it is too depressing.
Even when I was a size 10 to 12 -- I still felt overweight -- if I had only known what I know now -- this is overweight!!!
Take time, you'll get used to it -- you have worked so hard and now the attention is back on "you" not what you need to do to get there.
Congratulations!!!