If you want to be a roadie or on the tech crew, don't go to college. Find a conservatory program or something cheaper. You can do these things without a college degree, you just have to start working and taking all gigs / jobs you can find. College will teach you a lot but may not teach you things you want to or need to know and will learn and/or re-learn on the job anyways.
Our industry now covers so much more than schooling can ever teach us - Theater, Concerts, Corporate, Television, Film, Ride/Attractions, Event, Theme Parks... the list goes on. And then what field, lighting, sound, media, costuming, rigging, management, producing, direction,
etc.
Figure out what it is that you want to really start going into, this might be hard until you have really experienced each. The professional world in entertainment is different than high school as well. It's not always the same people, and a lot of people are really rough and gruff around the edges - it's a hard lifestyle.
You did mention working on a cruise ship, make sure you read up on the experience other members on this board have had. Also there are a couple good
book written about the general work experience by other crew members, I can't think of the names right now sorry.
One nice thought is trying to get a job on a ship right out of hs, save up money, use that money to pay for college, avoid student debts (the nice thing about cruise ships if you have no one to support at home, no bills to pay
etc. is that all the money you make goes directly into your bank account and stays there or you can invest it / have someone at home invest it).
I'm not saying don't go to college. Please do! You will help yourself in the long run. College is where I learned how to be a functioning, well thought, adult. I had experiences there that I will never forget and I have made friends who will last me a lifetime. If you are going to college and have a passion for anything else, do that. Take engineering major, when you are done with college, you can always get work as a techie and work your way up.