It was. When I first arrived here, I only knew the alphabet and probably "hello", since English classes have just barely started in grade schools in China. It didn't take very long though, I think I was fluent within the year. I would recommend watching a LOT of TV with English subtitles, and read English books/newspaper like crazy even if it's hard.
I should also tell you that your English is excellent! Are you studying the languagein school as a major?