Does anyone learn a second foreign language?

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I started to learn Japnese by myself when i was in high school. But until now my Japnese is still bad. I have tried many ways to improve this, well, it seems little effects. And another thing i think weird is that why chinese students always failure in study english, of caurse, include me. I mean "always" because from primary school, we have already learn english more than ten years. Does anyone learn a second foreign language? And any suggestions?