Why is Scrooge as he is?!

Questions I would like to have answered by Scrooge:
Scrooge,
1. what happened that you´re so crabby?
2. why do you hate christmas?
3. would you like to have friends or are you happy so lonely?
4. can you tell me more about you´re life when you were a child?
5. what were the characters of you´re parents?

I would like to know why he is so crabby, because the point of the story is, that he is everytime so cranky and as far as I have read it didn´t become clear to me. Also it is mentioned, as you know, he hates Christmas. So I wonder why and since when?!
I can´t understand why he is so lonely! Therefore I would like to know if he is happy with his life. Maybe his parents were also like him and didn´t have many social contacts. Thus he couldn´t have friends when he was young.
But possibly something awkward happened during his boyhood.
(164 words)

P.S. :
This story is also made as animated film (a bit overdone) by DISNEY`S. If you want to see it follow this link to the trailer.
http://www.youtube.com/watch?v=PW5w90sDBrw