You got good advice here. There are almost NO US Deep Sea jobs that aren’t Union, or require thousands of dollars in training to even be considered. Try the tug fleet, either inland or coastal. Much more opportunity and possibility for advancement than deep sea.
My best advice: Stay the fuck in school get a degree in just about anything (other than art or history) and stay the hell off the water. It’s a hard life, it’s hard on families, its hard on your humility, and above all its hard to keep a marriage together. Just sayin’!