His father died before his time.
"You’re a man now," the village people told him.
"If being broken-hearted is a man," he replied from his despair, "then, yes, I suppose I’m a man."
I’ve been thinking about loss recently, after a bad dream I had a couple of weeks ago. Hiccup must spend his days struggling with guilt and pressure, how painful to live without the one person whose role you’ve now received.
This kind of grief is not something that is easily conquered.