Hi, Kuzey!
Just find opportunities to listen.
Watch English-language movies. Find English-speaking people you can spend time with. Listen to English-language music. Go to cafes or restaurants where you can listen to English-speaking patrons. In general, expose yourself to the language as much as possible.
Most importantly, be patient! There are many forms of English, the rules are complicated, the exceptions are many, and the idioms are countless. Even native speakers make frequent mistakes. So expose yourself to it as much as you can, and allow yourself to pick it up a little at a time.
Enjoy the journey!

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