You have to live with an English native for years and mingle with English natives, but than it is not guaranteed you will think like one.You might catch the accent ,the modes of expression but not necessarily the way of thinking.

You will need to expose yourself to as many cultural influences as possible.

If you want a British accent look at http://www.usingenglish.com/links/Listening/ http://www.usingenglish.com/links/Sp...Pronunciation/

Learn as much as you can from listening to other speak and practise speaking English daily. Perhaps you can go on exchange to an English speaking country to study there.

I have a Brazilian friend who told me at some point he started to think in English. It just takes a long time and a lot of work.