My "vacations" when I was younger and still in school were always to visit relatives, not places. Now, it's almost always to travel to visit a friend - probably because of this very thing. However! I did travel internationally last year, solo, for my birthday. I was pretty anxious the whole time, but I made sure I'd be around people. I joined day-long tour groups in a very scenic area, and even with the loneliness, jet lag, and everything else, I had a wonderful time. Very glad I went and did the thing, and now I feel a lot better about doing it in the future.