Practice, practice, practice. Alone, in front of friends, in front of people you don't know well. Speak forcefully, as if you had all the confidence in the world.
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reallifewho's written english is just fineSome way from "fine", I'm afraid. I don't mean to discourage you, but there are probably twenty mistakes in your post, including some very simple ones like failing to capitalise "I" and failing to type a space after a comma or period.