I work hard, but it seems hard for me.
Maybe something wrong with my learning method.
What should I do?
Give me some advices.

Just speak to everyone in English and when you are bored, just do Creative writing in Microsoft Word (because it shows spelling mistakes and grammatical errors).

Thats all !

Maybe you could sign up for an English class at one of the language institutes near you. Find out which one has the best teaching method. It'll help you interact with your fellow friends and native speakers. Trust me, you'll learn way faster with a native. Just keep on practising.

Plus: you could also watch your fave English movies and pay close attention to the dialogues (or listen to English music and read books/novels written in English). Any word you can't understand, just look up a dictionary. If you have friends who speak your language, encourage them to talk in English so you all can improve together. Don't give up. You'll be on your way with a lot of practise.