A bad experience

In our class on May 5th. We worked in team  with Amayrani writing a little story about someone who was travelling in a bus but with a wrong way and suddenly that person suffered a bad experience with another passenger in the bus.
We have to use at the end of the writing the next sentence:
If only I hadn't boarded that bus …….
The next picture is our writing and at the end appears the correct form of the writing

One day a young man was travelling to another city to visit his grandparents.
He took the wrong way and got on another bus, he fell asleep and suddenly woke up when somebody threw the trash of his popsicle by the window and the water of the trash hit his face and the face of other persons. First, he felt angry with that man but finally he thought that the bad action of the bad man helped him to know that he was on the wrong bus.
If only he hadn't boarded that bus, he wouldn't have had that bad experience.