How does a motivational speaker become a motivational speaker? In the most basic sense, he or she has beat unfavorable odds, survived some ordeal in small or large degree, and is now prepared to share his or her experience and what was learned with the world.
But becoming a motivational speaker takes a bit more than undergoing an experience (we're all in the throes of some force we can't control); a professional motivational speaker must learn how best to deliver his or her expertise to the audience. A keynote motivational speaker has to command the room and incite others with the mere sound and rhythm of his voice. Some of the most famous motivational speakers are better known for their rhetorical skills than the content of their speech. Still other professional keynote motivational speakers hold a room in mid-breath because of the horror and triumph of the story.
So first find out who you are and how far you have come. Then submit yourself to motivational speaker training or motivational speaker seminars to learn how to present those findings in the most effective way possible--effectiveness being judged by how many souls you touch.