Cindy Sherman: ‘I enjoy doing the really difficult things that people can’t buy’

Ahead of a major London show, the artist talks about her childhood, therapy and her tricky relationship with successPerhaps the most intriguing exhibit in Cindy Sherman’s forthcoming retrospective at the National Portrait Gallery is the first, Cindy Book, a family photo album she began making when she was just six years old. It comprises 26 snapshots pasted on pages torn out of a school exercise book and placed inside stapled-together plain covers that are now stained and discoloured with