Some people react differently, i think it doesn't mean you don't care, but like someone else said you are in shock at the time and when you were alone it hit you and you were able to cry privately. For the longest time i was not able to cry in my earlier years like 30 years ago, i'm 53 now, and all the deaths i went through i was never really able to cry except when my sister died by hanging herself, but that was the only person i ever cried for and i know too many people that have died and i still don't cry for them i sometimes wonder like you if i am ok because of the fact i don't cry, i basically am soo scared to die myself and maybe that is why i don't cry is because i cant handle the fact that i myself will die someday too. I am obsessed with death i think because i do know lots and lots of my friends have already passed on, i hate the fact that we don't know when our own time will come. I hope i didn't scare anyone but it is a big issue with me and i know when i do die i don't want people to be crying but i rather hope people will rejoice that i hopefully will be in a better place.