Take the car somewhere else and try again. Letting car problems go usually ends up costing more. *Most importantly*, get in to see a psychologist. You're hurting. You don't have to hurt. Consider speech therapy. Many of us have a history of failure with speech therapy. But you're at the age I was when I finally achieved fluency with the help of an SLP that specializes in stuttering. I had a bad stutter and had a poor track record with speech therapy. Sometimes it's about finding the right therapist or program that works for you. Sometimes it's about being at the right point in your life where you are dedicating time and effort to improve your fluency. None of this is easy. We're here if you need anything.