I definitely agree with Sandra! Remember the 13th Warrior: he just listened and then repeated to learn an absolutely unfamiliar language! And this is actually how little children learn languages, isn't this? That's what you should do, I think. You may begin with quite obvious things like listening to and repeating simple phrases from the movies you like. Then you may replace or add words in them as you learn new ones (like "I'm a student" -> "I'm a girl who wants to become an advanced English speaker"). And, again, pronounce the entire phrases on and on. For the first time, you may even talk to yourself, it's quite normal, believe me! Good luck at learning English!

I think you need to gain more confidence in your ability to speak fluently so you need to speak more often. As we say, practice makes perfect !