All these varieties of speech are beautiful, just as the varieties of butterflies are beautiful. No matter what your first language, you should treasure it all your life. If it happens to not be standard English, and if it shows itself when your write standard English, the result is usually delightful, like a very pretty girl with one eye that is green and one that is blue.
I myself find that I trust my own writing most, and others seem to trust it most, too, when I sound most like a person from Indianapolis, which is what I am. What alternatives do I have? The one most vehemently recommended by teachers has no doubt been pressed on you, as well: to write like cultivated Englishmen of a century or more ago.
Kurt Vonnegut, as brilliant as ever, explaining the importance of simplicity, clarity, and authenticity in writing.via novelr.com