Odds of Getting In
Consider yourself lucky. With a thirteen percent projected growth rate over the next few years, you shouldn't have too much trouble landing a gig (source). However, that doesn't mean there's no competition. Like any other field, you'll be vying against other liked-minded individuals who are just as eager to prove themselves as you are.
Rest assured, there are a few ways you can increase your chances of finding a position—starting with living where the action is. Seems logical, right? If you want to work on the water, you probably shouldn't be sending inquiries from the middle of Utah. Make your way to the coast, landlubber.
To make yourself especially competitive, you could earn your bachelor's degree at a maritime academy and obtain your Merchant Mariner Credential. If the education route doesn't appeal to you, though, be a barnacle. Attach yourself to a ship and work your way up. If that means taking an incredibly low wage to start or just working for room and board, so be it. The sailor's life isn't all about that green, anyway.