It's only natural to be nervous when travelling solo for the first time, but we've all done it and come back to do it again so it's really nothing to be scared of. These days (post covid) most trips do seem to go from London, I go down the day before and stay in one of the Premier Inns (or similar) near to the airport. That means I have all day to get there and I'm not worrying about missing my flight. Hotels at the airports have some form of shuttle or hoppa bus services to the terminals. It's an extra expense but it's also peace of mind.
When you get to the terminal it's quite easy to check the departures board to see which area you need to be in, you shoudl then spot a JY representative who will help you to check in, If you can't find them don't worry there are also airport staff who will help.
Once you get off the plane at the other end, head through passport control and on to baggage claim. If you put one of your luggage labels on your hand luggage that helps other JY travellers to identify you, if you spot someone with a JY label on their bag then go up and say hello. You will often find that you're all seated together on the plane. If you still haven't identified any fellow traveller after you've picked up your case then head out to arrivals and you'll find a JY tour manager who will be looking out for you.
If you book a hotel for the night before the flight then you can post on here and ask if anyone else is staying there and if they'd like to meet in the bar for a drink/coffee.
But try not to worry, you will be fine, you will get to where you need to be and you will meet some lovely people.
For my first trip I chose Flavours of Tuscany (I'm not sure if it still runs) because it had a couple of very simple cookery lessons, I thought those would be good ice breakers. They were, and I made 2 friends who I'm still in touch with some 5 years later. Since then I've been to Canada, Croatia, Cambodia, Vietnam, Slovenia, Pantellaria, Borneo and Myanmar to name a few.
Find an area you'd like to visit, take the plunge and book, you won't regret it. Good luck and happy travels.
Rose