how to speak English natively?

i am a newcomer here. i am trying to practice my English. today i found this amazing website where people from diffierent countries in the world can learn and languages they want to. i am so exciting.
however, the thing that is confusing me is how to speak English natively as an English learner who speak English as a second Language. I am influenced by Chinese culture for years so that it is difficult to think in English when i am speaking English. And i am wondering what the best way to remember so many English words with different meanings is. sometimes i do not know which one is proper to express the meaning exactly in those words with similar meanings.
can anyone help me with my problems? and i am very glad to help you to learn Chinese if you are interested in it!