[lottin]

Interference absolutely does matter. Interference manifests itself in the form of a foreign accent, which most people have when they speak a second language. You're making an extraordinary claim, namely that you're able to speak a second language without a foreign accent. I find your claim extremely unlikely to be true, especially since you provide no evidence and you've shown that you know very little about language acquisition.

[deadbeeves]

"With correct pronunciation" and "without an accent" are not equivalent qualifiers. There's no such thing as the null accent. Obviously I will have an accent relative to any speaker, since I don't live in an English-speaking community and so I'm not copying the exact pronunciation of any single community, but rather approximately averaging the pronunciations of all the speakers I hear.

Like I said, I have no interest in convincing you. If you can't accept what I say for what it is, continue as you were.