That was one of the big problems when I was at Harvard studying music. We had to write choral pieces in the style of Brahms or Mendelssohn, which was distressing because in the end you realized how good Brahms is, and how bad you are.
I'll tell you why I like writing: it's just jumping into a pool. I get myself into a kind of trance. I engage the world, but it's also wonderful to just escape. I try to find the purities out of the confusion. It's pretty old-fashioned, but it's fun.