Didn't realise this was such a common challenge among people who stammer. Worst situations for me at school were when we would have to sit in a circle and say our names and introduce ourselves (somehow I find it's worse when you know when it's coming). People in class eventually learnt to say my name for me if I was asked. 21 now and the stammer is as bad as ever but my perception of what other people think of it has changed which has definitely helped. Keep pushing on.