I'm only 22 but can tell you that, unless your a D1 prospect, high-school sports are a once-in-a-lifetime opportunity. Having gone to a state championship in high school and dabbled in recreational collegiate athletics, the two just don't compare. If you are even a decent wrestler, take that to its potential while you can. If lifting helps you do that, so be it, but listen to your coach. Otherwise, you can always get stronger later, while you may never get the chance to compete in that kind of environment again.
I know lifting is fun and fulfill's a lot of empowering desires, but I can tell you that competing in an arena that has actual pressure and fans and teammates/people who care tops a 500lb deadlift hands down. Figure out how to get better at wrestling and just do that.
S. Emile Hughes
Current Lifts (December 2010): BW 166lbs; 285lb Bench Press; 315lb Squat; 175lb Overhead Press; 405lb Deadlift; 205lb Power Clean