I know how you feel! It will come slowly but surely. Look at what you accomplished...you DID walk into a "regular" clothing store and you DID find something to wear! That is such an awesome feeling, isn't it?
Sometimes I will hold up a pair of jeans or a skirt from the laundry and think "yeah, only my thigh will fit in this" even though I have worn them before and of course that is my size! Now that it is summer...I'm throwing you a challenge--say good bye to long pants!!! Only skirts, dresses and shorts. I did this last summer and it was uncomfortable at first, but then I got used to it. Now, I LOVE how I feel wearing those things!