¿Que quiere decir "let's trade"?

You have to learn English Since I was a child I have heard "You have to learn English this lenguage will open doors for you", for be exactly just I heard it on the school, and this phrase was bother me all my childhood and for this reason I hated that lenguage for many years, I tried to get away of that, I don't wanted to learn English and anybody could change my mind, but now, I see how big is the world and how many things I can learn if I listen to people whatever lenguage they talk, but, Is it so late for me?, I must give up now that I have many things that I want to say but don't know how do for this words arrive of the way I want?, would it easy if I had stared when I was a child?