Exercise! That will really help tire you out and the plus side is it's good for you and will get you into shape too!
you should be able to feel pleasure if you want, nobody should be able to tell you what to do, and your not going to go to hell or anything for masterbating, if you were do you think allah wouldve put that thing and your hand there for a reason, seriously, your a teenager relax and have fun, you cant worry about pleasing allah your whole life, live a fulfilling, moral, life and believe what you want, do what you want, just know that the actions you act on and the actions you dont act on are the same thing because even if you dont act on your impluses and wants they are still in your mind to linger around and bother you, just do what you feel is right, i really dont think allah will punish you for this... sorry if any offense it was not meant to be offensive...just live your lie how you want and dont let anybody tell you different