about learning English

Did you know that learning to speak English is an important thing in China? l have been learning English since kindergarten, but sadly I failed the English exam at the college entrance examination. At senior high school, my English teacher was Mr. Liu. He helped me a lot, and my English level improved greatly. At the same time, I also studied hard to improve my English by finishing many practise courses every day. Sadly though, l just feel that I cannot compare to the best students in my class. l personally feel ashamed, and feel like I let Mr. Liu down. What can I do to improve my English language ability?