Hi and welcome! I am sorry you are dealing with Crohn's at such a young age. If you are experiencing symptoms, I'd suggest speaking up to your parents and seeing your doctor. It's important to address any symptoms before they get worse. And by being proactive, it sometimes is easier to address any arising issues.
But in the mean time, try you best to relax and take your mind off your Crohn's. Stress can make you feel worse. Read a book, watch a movie, chat on Facebook - do whatever you do to relax. Also, watch your diet. You may want to stick to a bland meal plan for a little bit. When I am not feeling my best, I stick with easy to digest foods - rice, soup, chicken, fish, potatoes, applesauce, yogurt, toast, and oatmeal. It isn't exciting, but it sits well.
I hope you feel better soon.