I'm 14 and I need to loose weight as quick as possible !!?

Sup guys! I'm 14 and I'm going on a diet after the 4th of July and I need some suggestions?? I'm 6'2 and 240Ibs I don't look fat I just look big haha but I would like to get to 200 or 220 idk some where that range I know that's not realistic but I would like to get as far as I can before High school starts.. I was going to join football but couldn't get to summer camp everyday so ehhh that's out the door :( but any thing will help !! Please "HELP" !!