Watch TV series ( or movies ) , cuz they keep the same subject along every chapter. Plus they use conversational expressions and they don't speak at 1000 mph. However, be aware that they don't say the things in the way regular people will do in real life, so, use the shows just to improve your skills in understanding and structure ideas. Then try to learn Idiomatic expressions, since they may not make sense at first, but the people use it all the time in their daily conversations! Hope it works for you as it did for me!
Also, pay attention to the accent and even the way native speakers use their mouths since the sounds that you already use in you language may seem alike, but they are different. Make an extra effort to make the correct sound and not just an imitation or attempt! Plus, enjoy yourself, don't be so self aware, and take it easy when you make a mistake, we all do.Later!