For sure stick it out. It is just three more days. It may seem like forever, but please do stay with it. I know I sound like an old person when I say when I was your age...when I was your age, that was the toughest time for me as a stutterer. I think it is like that for most stutterers too. Everything you are doing in life is for the first time. Being a teen, and progressing toward adulthood can be a challenge all by itself, let alone with a stutter on top of it. You are already on the right track of life and seeking out an apprenticeship. Continue to find your passion. When you grab hold of it, it will never seem like work.