Don't be worried about that. I have the same experience. Here are some suggestions for you to learn English.
First, you can go to English corner every week. There you can practice speaking English with other people.
Second, listen to the teacher carefully,and take notes at class,then pay attention to reviewing them every day.
Third, you can watch English programmes such as TV series, movies as well as news on the Internet.
If you follow my advice, your English will be improved.