I can't concentrate and I am having difficulty in school?

dont ever listen to someone trying to "diagnose" you, you can diagnose yourself in just knowing that you are in high school you have hormones racing. You are at a point in ur life that is hard... it was hard for everyone. Just try to chill and relax.... think about ehat you want to be take day by day. Think positive, dont do stupid stuff like hit the walls because what does that do for you? NOTHING. what does something for you is to be positive and know this point n ur life will p. Just for rel take one step at a time. When you r in cl try to just listen to what is going on. Keep all distractions away, dont talk to people or think about what u r doing after school. Gradually your thinking process will get different if you just try. I wish you the best and I hope u can make it threw this, u r young make something out of your life!