建议楼主稍作修改会更好
Our life is just like a football match,and in which we are the 'keeper' or the 'attacker' ,only when we keep a optmistic attitude and believe in ourselves can we finally win the game.
本人翻译如下
Life is like a match,and in which it seems as if we just act as “keeper” or “attacker”,only with the confidence and have a correct estimate of ourselves,can we finally win the match.