DEAR HARRIETTE: I was offered a job, but I am on the fence about taking it; I want to know if my reasoning is stupid. I’m 19, and I don’t necessarily need a job, but I would like one to pay off my credit cards faster. I got permission to miss a week at the end of June due to my best friend coming to visit me in New York right before my birthday. We’ve had this planned for months, and I knew immedi…