Hi Veronica,
Many here have offered you good advice about getting over your shyness of shopping for female clothing. What you have to keep remembering is that as long as you are polite to the SA's, they don't really care. However do stop purging your female wardrobe. It doesn't stop your desire to cross dress and it just prolongs your guilt feelings. Read the many posts here and you will find that you are not alone and not very different to many in this World. Also, go to somewhere like Amazon and look at the many useful books written about cross dressing. If you can afford it, find a good counsellor and talk it over in a professional atmosphere.
In the meantime; relax and enjoy being a lovely human being with a desire to look pretty and feminine. It's OK!
