As Paul said, most of us have been to Antarctica (or in my case, am in Antarctica) with government programs. These programs generally prefer to use their own nationals, but that is not firm.
There are a number of jobs down here that don't require too much specialist training, and your familiarity with motorboats may be a selling point even if it would not be your primary job. Also, the people who come down here are typically either young (haven't started a family yet) or old (retired from their regular jobs), with a few middle-aged tradesmen like myself - so your youth is not necessarily a problem, as long as you are at least 18.
However, summer season is coming soon, and it is rather late to be applying now - but not quite hopeless. Typically, you will want to apply for these jobs by April, or May at latest. Occasionally they have trouble finding the people they need and recruit them later, but these are usually professionals or people who have already been down.
Do you mind telling us your nationality?