That’s awful. I’m sorry you had to go through all this. They should have known better! Have you ever tried confronting them? You need to let this out and they need to know they have done you wrong, it might help you, maybe just slightly. If there’s a way they could do you better, don’t be hesitant to let them know. This is a real and actual disorder. There isn’t a main cause that can explain why people stutter, perhaps if differs from a person to another - but recent studies have found, and this is posted everything, that’s there’s a dysfunction in the area in the brain responsible for producing speech. If you are interested, look it up. YOU ARE NOT LAZY. PERIOD. You are anxious. You are worried about people’s reaction. You are not sure others are patient. You can’t guarantee they’ll understand. You can’t tell whether or not you’ll be ridiculed. You don’t know if you could manage uttering what you’d like to say with less ‘interruption.’ This is huge and this is real and valid. That’s what they should be tackling. If they can’t believe any of this then please validate yourself. You know it’s a disorder and hence it’s not your fault. You know the reason you don’t raise your hand isn’t because you are lazy. By the way, I stutter too and severely, and I also have social anxiety, and I can’t lie, it’s hard and it’s frustrating but it really gets better. I’m in my fourth year of university. I’m pursuing a double degree. I’m graduating soon. I’m trying my best. I have friends. I have people I know. I had partners. I did things and I do things. Bad things happen along the way, I had days where I could barely say a word and others days where I can say three words without stuttering can you imagine!! But hey I’m here and I’m living.