I(21M) can't give you anything magical to get over the sadness and embarrassment but if you want I can share my one experience in which I can say it was very hurtful for me. So I was in line for some government paperwork and didn't knew anyone there and it was a very big line I had to wait for an hour just for my turn and when my turn came I didn't know why but I stammered and the government employee was like "say what you wanna say or go home" and just pushed me out of the line and it was so bad that I didn't even had any will to fight and tell him I had some speech problem. So I just went home and cried the entire night. So I just wanna tell you that don't put yourself down more because we stammerers already feel low enough in life.