I'm doing my first JY holiday next month and have booked South Africa Explorer with an add on to Victoria Falls.
Like a lot of people on this site, I am rather nervous about travelling on my own however I made the choice because I did not have a companion to go with. However I'm sure I will make a lot of new friends who are in a similar situation and have just as good a holiday as I would have done going with someone I already knew.
My advice is go somewhere you have always wanted to go to, whether long or short haul and just enjoy yourself.
Mike