But I was wrong

I saw a boy was singing in a train,
I thought he begs from passenger of the train,
But I was wrong to understand the fact,
He tought me how to be happy when situation is  bad.

I saw a poor man  balloons on his hand,
I thought he wants his balloons to sell,
But I was wrong to understand the fact,
He was selling balloons with the breath.

I saw an old man one side of road,
I thought he needs help for crossing the road,
But I was wrong to understand  the fact,
He wants to show me my future and fact.