How can I become fluent in English?
Shout, at least once a day - Go to the rooftop literally, and shout aloud. Do that for some minutes. Speak something sensible if you can. It will train the mind not to be scared of anything. Of course, if you do that elsewhere, people may beat you up :)
Love yourself for what you are - This is perhaps the most crucial step. If you hate yourself for not being a fluent English speaker (as per whatever random benchmark you've adopted), your sense of self-worth will be destroyed. Don't let that happen to you.
I have come across some really fast speakers who talk sense, and some who are idiots; some measured speakers who talk a lot of sense; and some slow speakers who are a pleasure to listen to.
It all depends on your profession, your eye-contact and body language, and the choice of words + depth of knowledge.
So relax, and start your personal journey of success! It will take time, so buckle up. Wish you great luck.