I am cuurently in Oz and planning to stay another 18 months or so before I go home. I am going to travel thought Asia and Europe, NZ and Pacific Islands on the way home but will be going alone. I am okay with this but sometimes I end up thinking argh I don't know if I can do it!
I woundered if any other girls had done a big trip alone and how you found it?!
I have done several trips alone.
Anyway, I think u are likely to meet a lot of people, during your trip, so u wont be endlessly alone. U might even find a travel companion, along the way.
I did a lot of solo traveling in Europe, Africa, western Asia and Latin America. There weren't many lonely moments, actually just when I chose to have these in my tent or hotel room. You simply attract companionship when you're traveling on your own - sometimes even more than you want. So I wouldn't worry too much, if I were you.
There are websites, by the way, with information about the do's and dont's of solo traveling. Why not check these out, to help you get over the threshold. Try www.travelaloneandloveit.com, for instance. It contains useful information in itself, plus many good links.
Happy solo travels!