As far as improving your NATURAL English in general, there are several things you could do. First off, read the book called "The Firm" (by John Grisham); secondly, watch the movie itself. Another thing you could do is watch native speaker youtube videos. As for communicating with native speakers, I'd advise you to join a good chat-room and participate in its discussions. Don't worry if you don't get to socialize with native speakers so often. We've got the Internet. We've got Skype.
Mastering English is hard work upon yourself. You ought to have a lot of time for English. I am only kidding when I say you should read the specific book I've mentioned. But, personally, I simply fell in love with the language it's written in. It's so conversational and at the same time simple. Good luck with your endeavors! Please forgive me if you feel I'm patronizing you! I didn't mean to! Just a friendly piece of advice from a true fan of English.