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What is ‘boat’ in this context?

It’s not illegal, but the airline could cancel your return ticket and/or blacklist you.

While it doesn’t necessarily need to be stocks, investing early will greatly reduce your financial burden later down the road if you want to save for retirement. Check out the cost of waiting:
https://www.primerica.com/public/high-cost-of-waiting.html

It doesn’t even need to be a degree, honestly. You could go learn a trade. There are many trades that pay much more than many white-collar desk jobs. I’d say check out your local community college, trade school, or similar to see if anything looks interesting. Contact them and request more information or even a tour if something does. Regardless of the route you take, you definitely want to learn some sort of marketable skill. Also, there’s nothing wrong with pursuing a career that’s just tolerable or boring, but pays the bills. You can seek fulfillment outside of work.

As far as not knowing what to go for at 21, I just worked after graduating high school at 18, and it wasn’t until I was 23 that I decided to go back to school.