> OK, she is elderly and some discount may be fine

And who reimburses the rail company for those discounts?

> the girl on my left has payed 45% less than me (OK, she has a special discount as a woman and booked the ticket in large advance)

"she has a special discount as a woman" - What? I call BS.

"booked the ticket in large advance" - better. And what's stopping you from doing the same?

> (OK, because he is an employee of the railway or of the government)

And how many of those there are?

> Simplified, I am the only one that is paying the full fare.

Simplified, you are someone who exaggerates to use as an excuse for whinging about non existent unfairness.