Undergraduate / Being the captain for my school's soccer team - elaborate on one of your activities [4]

I need some advice and corrections. please help!

I am not involved in every club in my school; however, I have great passion in soccer team I participate in. Being the captain for my school's soccer team for two years, I have had the opportunity to challenge myself. The team members included students from 7th Grade to 12th Grade. This wide gap in ages made it difficult to unify everyone as one whole team; however, in my role as captain, I had to encourage everyone to have the same goal. Every time when the team went out for competitions, I had the most important responsibility. I had to encourage my team and make sure that everyone was concentrating on the game. Because I didn't want to lose, I would sometimes yell at the members for the mistakes they make, but also compliment them for the nice plays they create. The team was becoming stronger and indomitable as I trusted everyone in the team.