I'm not sad that my dad died today
I'm so sorry that happened!  What do you mean you're not sad?  How do you feel?
I believe others think I'm supposed to feel the same way like them
It's okay if you're grieving. You might want to talk to a professional if you're not experiencing grief. It's important to be able to experience emotions for your mental health.
I'm going to ignore this question, let me ask you something
I don't think we should change the subject.  Listen, if you're having emotional issues like that in a time of such importance, it's important to find someone to talk them through with.