My advice would be to choose somewhere you'd really like to go, read the itinerary to make sure you're happy with it and then book it. You'll be a bit nervous, it's natural, but we've all been there, all survived and all come back for more!
When you travel my top tips are
1. Never be afraid to ask, if you're unsure about anything just ask someone. Whether that's at the airport, at arrivals or wherever, never be afraid to ask a question.
2. Put your JY label on your hand luggage, that way others can spot you and will say hello, look out for others with labels and don't be afraid to say hello to them. JY usually sit the group together, or close by, on the plane so you'll often notice fellow travellers then.
You'll be well looked after in a group of like minded people.
Go for it, you won't regret it.
Happy travels, Rose