It's important to understand that you win as a team and lose as a team. Always stand up for each other. Most successful people are givers, and they are also happy people. Team goals are more important than individual goals. That's not the mark of a good teammate because it's selfish.
Teamwork requires unselfishness.
If you are the star player, you shouldn't expect to be treated differently than the other players. You have to play within the team framework and be team oriented if you want your teammates to look to you as a leader. Teamwork means you have discipline. Lots of players will take bad penalties that hurt their team. Players who want to win won't hurt their team in this way.