You can't!

You cannot be a native speaker, you must be born and grow up in say, America, and speak it all the time too. However you can come close to speaking like a native speaker. In fact close enough to be mistaken for one. My innovative technique for doing this is part of my system I call NLLS (Natural Language Learning System). I have written about it in my notebook entries, which I recommend you read.

The faster way to improve your English is by listening to English lessons for long time let your brain think and speak like English ,but first you should listen.