Is my heart two sizes too small?

I have zero connection to Christmas.
I am not a Christian, so no spiritual link.
I don’t understand fellowship toward fellow man and charity only being applicable for a few days in December.
I hate shopping at the best of times and I really hate being shouted at. Do I have to prove my love by giving things? And if I do, why only in December?

Is my heart full of unwashed socks and my soul is full of gunk?