Everyone has great insight! I've worked on cars, motorcycles, chainsaws whatever since I was about 10 or so. Thats what happens when your Dad is a gear head. I use to work on cars for a living but was then asked by a friend,"How would you like to learn the marine industry?" Here I sit 17 years later and have enjoyed everyday that I have and do go to work!! Some days when I go out for a test drive on the Bay in a 46' Cigarette with 1200's in it to tune in the carbs and do a check over, I think, IT DOESN'T GET ANY BETTER THAN THIS!!!!
But if you do decide to work on boats for a living, find a good company that will pay decent money and send you to school every chance they get. It will only make you better for them and for yourself. Also, everyone is right. Start at the bottom, clean engine parts in a solvent tank for hours, sweep the floor, take out the trash. It will all pay off. Earn your way to the top. Its better that way. I KNOW!!