Do it, Maggie! Travel is the best, and I think that travelling solo is a great way to meet new people and discover a lot about yourself as well. Though I’ve done quite a bit of travel before, it’s never been alone, so those are some of my reasons for doing this trip!
The US (and Canada, by extension) is a good place to try travelling solo - even though it’s different to Australia it still feels familiar and they speak the same language! Travelling in a group takes a lot of the stress of organising things away, too.
I hope you decide to book!