I'm a little shocked at this post topic because I have met very few people who don't enjoy being out on the water.
However some people are uneasy about sailing and I think rennisaint nailed the solution. Some people, even avid boaters (stink potters) feel uneasy on sailboats because they don't understand everything. I have had great success by putting the passengers in the driver's seat, while I run around and teach them all the
lines and show them how they affect the ride. One important thing to remember is to NOT YELL AT THEM when they DO screw up. This even applies when racing! Also, I am 21 as well are many of my friends, and we all know how drinking and sailing go hand and hand so.... there never seems to be a shortage of crew.