I tell the ferryman that I am Gilgamesh! And my life's goal is to find Utnapishtim and the secret of immortality!

He doesn't even look at me. He just repeats what the gods said, that men are supposed to enjoy life then die. We were not designed to live forever. I try bribing him, I threaten him, I reason with him, but he will not take me across the sea!
Should I use force? Or steal the boat and try to guess the route on my own? Or recognise my mortal limitations and admit defeat? Or do something else?