Sent this to a friend of mine, who did similar dumb stuff, albeit a few years older - but not much (19, alone from LA to Malta, ferrying a boat for a famous movie star) - who told me the record is held by Robin Lee Graham from Newport Beach, who did this when he was 16. He stopped all around the world. Took him 3 years and 2 boats. Came back with a wife. Oh yeah, old school, it was back in the late sixties, before GPS or Loran, so he did it using only a sextant.
Apparently it did not harm him, he wrote a couple of books about it, it was made into a movie, went to Stanford, and moved to Montana, started a building company and does a lot of international aid work. I spend my 16th, and 17th summers traveling with a band (and being very bad) and most of that turned out to be good, the work, the money, the independence, and all the stuff you learn when you have to rely on yourself, and not other people - or at least in people in your peer group.
I'm just trying to say that you can do pretty much whatever you set your mind to do. And there are people doing just that.