Bigger boats and everything that goes with them is all very expensive. Not too expensive, I do it about as cheaply as possible... But you got a long way to go before you can even get a job and start saving money
. Start now, Save every penny you get. When you get a job, do it with the purpose of saving for a boat. You'll get there...
As for sailing, if you're a member
of the yacht club you have a great start. Just start crewing
for the local races and maybe even get a little dinghy
(make your parents get you one!) or use the yacht club boats. They should have a small fleet of boats they will let you sail with when you're ready. I'm not sure how that all works, but that's pretty much what yacht clubs are for (besides drinking beer
and looking cool).
Don't worry about the bluewater thing yet, you got plenty of time. Just go sailing whenver you can, on any type of boat you can, and save, save, save.