You guys are mostly right! Good job. :)
As someone mentioned earlier, cookie cutters are used to make the same shaped cookies. So a cookie cutter life is a life that is routine and like everyone else. For example, a cookie cutter life is a life where you go to school, graduate, get a job, marry, raise a family and then grow old. Saying you don’t want that kind of life implies you’re bored or want new challenges and excitement in your life. It means you don’t want to fall into the trap of having a routine, be too comfortable and follow normalcy.
Good job guys 🥳