You won't be solo-traveling because you are going to be meeting so many friends! You will be surrounded by people when you're there!! So exciting that this is your first "solo travel" though!!!
Since I've done plenty of solo traveling, I already know how this is going to turn out- you're going to love it!
I hope that helps ease some of your anxieties... just some random girl on the internet telling you that you're going to be fine! Afterward I may even be shameless enough to say "I told you so!"