Congrats on your first trip to Kcon!
Well, if you're under 18, I think you have to have a parent (or an older sibling, if they're coming with you) with you when you go into the adult panels, games and want to buy 18+ merchandise. Otherwise, you're free to go anywhere you want.
Once you get the pocket guide at the convention - you'll get it when you go to the parking garage under the Hilton hotel for your badge holder - you can see all the events at Kumoricon available during the three days. The ones that you're unable to attend alone are clearly labeled as being an 18+ event; such as the Cosplay Dating Game 18+ (there's one that's not 18+ that you can attend) for example.