My mother told me by telephone, that the father of someone she knows well and I know a little, though he is in a "way" family (by what I mean, she has got a lot of close contact to him), died and she told me I should call him to condulate.
But I could not do it, because by preparing this phonecall in my mind, I had the words prepared "I am sorry about your fathers dead", but then into my mind came a "blur", where I had no image/imagination what could follow this sentence that I prepared, so I would not know how this conversation might proceed, so I didn't dare to do this phonecall anymore and didn't do it at all.
When I was ten years old, my fathers mother died and I told to my father "I am sorry about your mothers dead".
I don't know how to continue or what I am expected to say elsewise and it makes me nervous, so I rather say nothing, but I also know, that people expect me to say something.
I got often told, that I am not "spontenaous", but I just have no idea what to say in many situations or if I have one sentence prepared I do not know the second one.
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English is not my native language, so I will very likely do mistakes in writing or understanding. My edits are due to corrections of mistakes, which I sometimes recognize just after submitting a text.