Wetting The Bed

Why do I wet my bed? 
Why do I wet my bed every day? 
And get scolded every day. 
It's terrible for mother in winter. 
But I can't help it. 
My father used to wet his bed when he was small. 
Still, my father scolds me. 
Then, I get angry and hit him.
My father laughs. 
Everyday nobody likes me because I wet the bed, yet I'm smiling. 
I'm smiling all the time.