Sorry you felt so uncomfortable and guilty.  Perhaps you should question yourself why.

You decided, as do some others, that spending more on airfare made sense to you--and bought you more comfort.  Others, including those with money to spare, decided to sacrifice comfort and save money.  Nobody is forced to spend or not spend (and nobody has a "right" to air travel).

If your guilt comes from what I consider a delusional view of society, where absolute equality of everything is the ideal, then good luck with real life.