I used to be like that too. I attended several public speaking training sessions. The groups were very supportive. Their feedback and acceptance helped build m

I used to be like that too. I attended several public speaking training sessions. The groups were very supportive. Their feedback and acceptance helped build my confidence and with it the ability to better handle the sorts of situations you describe. There are such groups in most cities. Give it a go. You will be surprised how quickly you will overcome your awkwardness.