I don't understand this sentence, especially the highlighted part
I realized I had far from enough for the fare only after I reached the ticket box
If you guys understand it please explain to me, thank you!
To have far from enough for the fare means that the person didn't have enough money to buy a ticket.
"Fare" is a payment for travel, and the rest of the sentence means that it is not a case of missing for example 1 cent to the whole price, but more like not even having 50% of the required money. And that is a long way from having enough.