English Accents!

Have you already made up your mind to follow a specific English accent? As for me, I just chose American English to follow a few months ago. To be honest, my English accent is mixture of Vietnamese, British and American (accents). So it is very difficult for foreigners to understand my speech. This is the reason why I decided to pursue learning the American accent. However, the American accent is not as easy as I thought at first. One of the most difficult things is R-controlled sounds and I still have been struggling with this stuff/it since I decided to follow the American accent. My friend who has been living in the USA for ten years, told me that it would take for years in order to get the right american accent right. Even for him, his American English is still far from an American native speaker. This information makes me feel somewhat worried about my target, but I am trying my best to get the right accent. it is better to say in this instance the accent right though we still would understand what you meant.  To say "right accent" implies there is a "wrong accent" but what you mean is speaking with a well-formed native accent

Please correct me! Thank you.