thank you guys for your comments :)

But don't do this in public maybe they think you'er crazy cause you'er talking to your self :P 

http://www.bbc.co.uk/learningenglish/english/features/pronunciation

Make shadow for someone ( repeat what they said)  this was very helpful for me and it's fun you can pick what you like and enjoy . 

Try doing a language exchange with a native speaker or watch some British tv shows or films so that you become accustomed to the accent.