Hello @triangle4321, so sorry you lost your Dad so suddenly and so young.
I lost my Mum last week but it was expected. The end itself was unexpectedly sudden but I was there and so really in terms of these things I was lucky.
But I find myself in the same position as you. I feel pretty normal. I "know" that it's real but that's just my intellect saying, you saw her die and therefore ... I don't feel the loss at all. Sometimes I feel a faint sadness which is almost theoretical IYSWIM.
Do you feel you should be grateful for not being wracked with grief but actually you're deeply resentful that your psyche can't just be bloody normal and let you cry?
It was my Mum who was lovely and who I loved dearly, I want to mourn her and come to terms with her loss. And yet I've reported and registered her death, buried her and planted up her grave, have been sorting out her affairs, all pretty much completely calm and even cheery.
The sudden nature of her death did my head in a bit too. It's like I don't have coherent memories of that even though, you know, it was in the middle of the day and I was there throughout. The book "The body keeps the score" has some interesting stuff on how memories work and why this happens with traumatic events.
I have requested counselling through a work scheme but I feel a bit of a fraud. My problem is that I have no problem? Awkward no?
Some reading suggests our reaction may not be that abnormal but I would say that if it were truly natural we would be OK with it and we're not...