Yes, it's no use to learn either British or American English... because the best accent in the world is the one that goes like "We are sinking!" - "Umm, what are you sinking about?".
I gotta say that copying is not that good though,we cannot help doing that thing,cz better than nothing,making yourself comfortable does really matter,but making the people talking with you comfortable is more important in my mind....so at least try to acquire a kind of accent as possibly as you can^_^