SO ANGRY! What do i do!?

IM P'D OFF! Yesterday I was coming home on the train and I dropped my return ticket and saw this guy pick it up. Anyway I thought well I doubt there will be a ticket officer and if there is they'll know I paid because theres a barrier in Brighton anyway. Well I got off the train and there's only a ticket woman there so I said I had lost it and she goes "Well Im gonna have to charge you a �20 fine! Included in this was the cost of another adult ticket (�3.20) I'm barely 16! I don't HAVE that money! I Don't even have a job and im so angry! I Hate how they scam innocent people and always pick on teenagers because they ume we're all criminals! Whenever I get on the train even though they are standing at the other end they always come to me first and they are so rude to everyone especially young people. I'm sick of bus drivers and ticket collectors not treating us with respect just because we're teenagers. We're still customers and should be treated like everyone else!