In regards to your impediment. Unless you require speech therapy for everyday life, i.e. severe, you will have no troubles. I say this in agreement with previous posts of the well circumscribed comm that is expected and happens in aviation at all levels. From personal experience I can tell you that the worst speech impediment is light years more understandable and appreciated than the horrible english evident at various flight schools with ltd english speaking skills from students and others from non english speaking environments. Pursue your passion. As others have said, either work extremely hard and make large sacrifices for a professional career in aviation, or alternatively make enough money at a job that allows you to pursue the aviation passion at some level. All the best