You were very excellent, however, because those negative people around you affected you, so the lack of upward pressures on you, lose the forward momentum and become tacky, so banal.

原本你很优秀，由于周围那些消极的人影响了你，使你缺乏向上的压力，丧失前进的动力而变得俗不可耐，如此平庸。