Saw family die in the hospital, dont know what I'm feeling

He died a few hours ago on the emergency table. I was never close to him at all and barely talked to him even though he lived in our city. My family and his was in the waiting room. Everyone started crying and sobbing, shaking hard when we got the news. I shocked and uncomfortable but mostly empty inside, not even sad- I couldn't cry at all. Some of his family kept looking at me like I was an emotionless monster. Afterwards I saw his body on the operating table, he looked extremely pale and like he was sleeping. I have an intense uncomfortable guilt now over my lack of reaction. I was never close with him and had no real connection. I feel bad that he died, he was always nice to me on the rare occasion we talked. I'm worried I might be a sociopath, I've never had close emotional relations with anyone and generally only experience intense anger or fear... I dont know how to get past this, everything happened so fast. I feel like a heartless monster, I feel guilty for not caring so much. Part of me is scared of going to the funeral and having to pretend to be sad. I'm still in shock. I kind of wish I could go to sleep and wake up to find it was all a joke. I keep wondering if he was satisfied with the life he lived or if he realised today was his last day on earth. I wonder when the day i die will be.