Are you kidding? Go.
I did something similar at 18 but on motorcycles, saw a lot, traveled a lot and had a great time, met many good people and had many good times. All those "friends" that thought I was crazy took the safe path, and still regret it, their still too fearful to try anything outside of a Disney trip, many have died since without ever tasting a little adventure, it's sad.
I did that for a number of years, I knew i'd have responsibilities someday and only had that kind of opportunity while debt and responsibility free, then married in my late twenties and didn't have a vacation
at all for years, kids
, house, career, etc, etc.
There are some things you can only do when your young, and some things you can do when your older and not as physically capable.
Now 40 years on (and married for a second time) I'm planning on taking off cruising with my wife and boys, it requires a buttload more planning and bigger boat!
Go now, go cheap
, have a ball.
But please, use good judgement, all here would like your trip to be fun, rewarding, safe, OK, not completely safe, that wouldn't be any fun, and most of all to live to tell the tale.
Cheers, have at it.
I've never regretted taking the opportunities when they arose, it's made for a more rewarding life that's still moving forward.