I secretly wanted my high school football team to lose when I was on the team
How scandalous. Why did you want your team to lose?
I wanted to be the leading player on the team
How can you be against the team which you were in? It's wrong to want your own team to lose just cause you were not made the leading player.
The team gave me a raw deal and I was sad.
Just because you got a deal that you didn't want doesn't mean the team should have to lose. A sport like that is a full on effort with everyone, and it's expected you pull your weight. If you didn't like the deal, how about negotiating next time if something doesn't go your way?