WHAT I KNOWI once read that to be a good writer, you should write what you know. This is what I know: I gave up shopping for the month of February.I’m 31 years old and as much as I try to be self-aware of my own spending habits, I can’t live without gourmet coffee and new jeans. Sometimes when I’m running late, I’m too lazy to take the subway and I call an Uber. I never leave Target without buying a bag of things that can only be described as a “boredom mood…