you are joking! PLEASE tell me you are joking?!?!
1. if you want to show someone how good your English is...learn from English people.
2. You are not American so why would you want an American accent???
Improving your pronunciation is great, I fully support that, but copying an accent is not a good idea.
Your accent shows where you are from and hold a lot of "you" inside. Why are you in such a rush to change that?
I hate it when people put on "fake" accents...just sounds stupid.
(bit out of line maybe but i have strong feelings about this one.
I had a friend who did the same. Went to America for 1 year and came back with the WORST fake American accent EVER! Sounded so stupid, but he thought it was cool...don't do the same thing)