I've experienced a lot of death... and it just depends on your relationship with the person as to how you'll react now, and later.
Don't feel bad for not crying... don't feel bad for not caring. Similarly, don't feel bad if you start crying and/or express emotion any other way. Everyone deals with things their own way.
My grandparents were the people that "raised" me. My real parents were there, but not really. I was 16 when my grandfather died -- he died suddenly, though he had Alzheimer's for years, and "wasn't really there." I didn't cry until his funeral... but broke down and started sobbing toward the end of the memorial service. My grandmother died when I was 18... she developed a form of fast acting cancer, and we knew it was coming, about a month before she died. There are very few things I regret in my life... not spending every minute of that month with her is one of those things. I still think about her frequently, and still miss her.
I'd probably miss my mom, if she died... and would be sad for a while. My dad.... eh, I'd most likely be glad he's finally gone. He's nothing more than a huge PITA. When his dad died, the entire extended family threw a pizza party to celebrate that he is dead. I can only think of one or two people that were not extremely happy when that old fart died (my dad being one of those people that wasn't happy). Everyone else was overjoyed.
The point to my rambling? Hell if I know. 😛
OK, everyone deals with death differently, and it always depends on the relationship that you had with the deceased. Don't feel bad about how you feel, no matter what feeling that is.