My dad has recently been diagnosed with cancer

So my dad has recently been diagnosed with leukaemia and his treatment is starting in April. I'm not sure if this is normal but I don't feel anything or any different? And I feel so bad because I can't even image what he must be going through.

I never cry but when he told me I broke down and cried so much for the first time.  I haven't told my friends either so maybe that is why I don't feel any different?  Like reality hasn't kicked in? Sometimes I want to cry so much especially when I read things like "coping with death". I'm just wondering has anyone else been through this? Is it normal? 

Sorry I know it's a really selfish to be asking this but I don't know what else to do or who to speak to about it. 

 

Thank you.