John 1.6

'There was a man sent from God, whose name was John.'

John the Baptist was sent from God. He was chosen by God to do great works. He was truly blessed by God, but of course, in his more difficult moments he might have felt not quite so blessed. We do not know.
What we do know is that we are all chosen by God for more humble tasks, and yet, many of us, like Jonah, will try to run away.
We forget that we are not here to please ourselves, or indeed, to please other people. John was not sent by God so that he could work out problems with his troubled childhood or problems with self-esteem. No, John was sent from God to serve God.
So when we are called to work in the vineyard we should remember that God does not exist to serve us and to give us glory, but that we are are God's servants, sent to give God glory.
And if the work seems onerous, perhaps we should remember those left in darkness, and thank the Lord that we have been called to do his work.