Hiya,
I'm not going on this but wanted to say I did NYC trip as my first JY trip and you'll love it. Don't worry if people on the trip don't reply not everyone is on this forum and some who don't book directly don't even know about it.
You will be nervous I was as it was my first trip alone but push through those nerves and it'll be the best thing you've done I've since done 3 more JY trips and there's always some nerves as they're new people you're meeting but once you meet them the nerves go away.
NYC is a great city I've been back since my JY trip with a friend I made on that trip and want to go back again so you'll have a great time.
Enjoy,
Donna