how ironic my first expo was when I was 17 and I was alone.
If you talk to others and go to meets you should have fun. but if you don't it still be fun going around the dealers room and going to talks.
Also don't worry about the train I ended up getting confused trying to navigate the underground but I asked some people who looked like they were going to the con and they helped.
if you don't mind me asking what are you going to cosplay in may?
El psy congroo