A 5 is better than a zero, right? It does seem pretty extreme, but today's political climate calls for 'zero tolerance' in the school environment. Sometimes it's best not to make waves. You know: don't rock the boat.
Ever hear of a band called 'Motorhead'? They do a song called The Game. It's all about the game, and how you play it.
Nothing wrong with guns. When I was in school, we even had a school rifle team, and a rifle range in the school basement. Times have changed. Your job right now is to get through high school with the best grades you can muster. Leave the gun talk at home! Your grades are excellent; all you need to do now is to play the game for one more year. THEN you can go to work, or join the military, maybe even go for some more school if you decide on a college. Don't screw around with your future by drawing the wrong kind of attention to yourself now. You'll grow up soon enough, but for now, you have a job to do!
You're lucky you have an AR at your age. All I had was a .22.