Copy your favorite voice.  If you have pronunciation problems, which you probably do, then choose some native speaker and copy them.  You will probably need to listen to about 25 hours of them speaking and then you will be able to speak like them.  It is not quite natural.  It will help if you record yourself speaking and listen to it.  You might be shy to do this in the beginning, but after you get used to it, I am sure it will be no problem.  You can compare your own pronunciation with the pronunciation of the native speaker.  Most people don't do this part and their pronunciation never improves.  They learn some bad habit and it just stays there.  People can understand them but they know the accent is strong.  If you do this step, I'm sure that people will think you were born in an English speaking country.  It's so amazing and I've seen it with thousands of my own students.  It only takes about 60-90 days to totally change your accent and voice for all English words.  It's really cool actually.(Author: andylu2)