I didnt even know what autism was and that such thing even exists ever since I've read about it 3-4 years ago. You dont have autism just because you stutter. There is nothing wrong with you. You are not mentally or spiritually disabled either. So people can say whatever they want about this, but youre completely fine. All you need are some ass-kicking and awesome mates in real life to cheer you up when youre feeling low etc.