When I flew back from South America after traveling by myself for 1 1/2 years, I left the airport and hitchhiked from Miami to New York to visit some friends. They commented how I seemed more confident--they didn't know anyone who had done either. Of course, I could have disappeared anywhere and never been found. On the way I met people who were a##holes during their rides, and probably were before and after it. IMO the trip may or may not change you,, it depends on how you approach the trip.
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