You just got to let it go. Stop being fanatical about your grammar. Stop obsessing about your pronunciation. And most of all, don’t fixate on what others think about your language skills.
Stop controlling yourself. Just go with the flow.
The moment you find pleasure in using the foreign language is the moment when your brain starts adopting it naturally and seamlessly. Just immerse in it.
Simply switch into the English mode. Watch original movies and TV series, turn the subtitles on. English version only. The more senses involved, the better. Go for Netflix and HBO GO. There’s a whole world out there. You have history, nature, drama and so much more. Take your pick.
Go for The Tonight Show Starring Jimmy Fallon, Last Week Tonight with John Oliver, The Graham Norton Show or The Late Late Show with James Corden. And if you need a bit of grammar revision, choose English with Lucy on Youtube. You will love them all.
Feeling bored on your way to work? Listen to podcasts, switch that BBC radio on. And always carry an English book or magazine with you.
Once you program your brain properly and provide it with adequate amount of regular information, it will absorb the language naturally and smoothly. And from that moment on you will be able to use English language fluently and without too much effort. Cross my heart!