As a more manageable and not quite as expensive option: a shorter sail might be most of the adventure you need.

I live in Boston and at one point joined a sailing school/club out of Boston harbor. They had mostly 35’ boats but a few up to 49’. It was so much fun learning to deal with open water, complex boats, crew cooperation.

However the one thing I wasn’t in a position to do …. They organized cruises on the bigger boats: form a crew and sail to the Caribbean! While it’s nowhere near around the world, something like this is a couple weeks at sea and seems like a really cool adventure