There has never been a successful team without unselfish role players. When the U.S. Olympic Women's Ice Hockey Team won the gold medal in 1998 and the U.S. Men's Team won the World Cup of Hockey in 1996, they had great players who were all used to playing on the powerplay and being the best on their team. But they won because they were willing to play the role the coach asked of them. They played as a team and they played for each other. Those are great examples of teamwork.
Hockey is a game of mistakes.
Don't get down on your teammates when they make a mistake. Instead, let them know you're still behind them. When you make a mistake, admit it. Your teammates will respect you for it and you will be less likely to repeat the mistake. Don't try to rationalize your play by blaming others.