Aint nothing wrong with you. We all grieve differently, who knows, maybe some little thing will come up and a memory will surface and you will feel what you feel you should. Its not like the grief police are gonna lock you up
I agree with Mystery, if u need help talk to professionals, if they didnt work they wouldn't exist.
Heres a vitual manly handshake and hug, best I can do.
If I had to guess I would guess it hasnt sunk in yet, I wish u luck when it does. I bet your parents could use your strength at this time.