I think most, if not all of us have been in the position Derrick described. I think back to my days as a 20-23-year-old TD (at a mega church???) . What was I thinking? And what were the people who hired me thinking?
I had a few good sound-checks, a few great services, and I showed-up with a smile on my face. My first impression got me a job.
The problem was the same for me. I was starry-eyed, pretty-much fresh out of college, and thought that I had the right way of doing everything. Looking back, I was kinda' the same idiot you're talking about, but with actual power behind my position, which made me 30-times more dangerous.
I was in a similar situation to yours, in that most of my volunteers were at least 20 years older than I am... some were friends of my parents, so they'd known me since I was 2, and had seen me as the stupid Jr. HIgher, and I thought they needed to get past that and realize that I knew it all now. Man, God had fun kicking me around for a little while.
I spent some time doing live production based in Chicago and Las Vegas, and doing a ton of church consulting with the same company. If you want to find-out how much you don't know, I highly recommend the route I took. From getting my butt kicked (literally and figuratively) by the pros in Vegas/New York/Chicago/etc, to seeing just about every type of church production one can find in this great country, I got what seemed to be one, gigantic, proverbial kick in the butt from the man upstairs.
Now I'm back at the same mega-church, through some amazing stretch of Human Resources imagination, and handling special projects within my realm of knowledge... which is exponentially greater than when I "knew it all." I still don't know everything, and often have to take a step back, put myself on hold, and figure-out what the deuce is going on before I shoot my mouth off (which is still too big for my own good).
Some of the best relationships I have with volunteers are they ones where I have been asked a question, and I've outright said, "I don't know, let me see if I can find you he right answer." Some of the worst relationships I have are the ones where I said, "No, no, no, you're going the wrong direction, do it this way, trust me, you're just an amateur, I get paid to do this." I was the guy who said that and everyone could tell, pretty-much right away, that I was talking out my... you know...
So, as a 16-year-old. Get in there and show them what you can do. Keep working your butt off, and do it with a spirit of humility. Put together great mixes, be the friendly guy behind the faders that the band loves to work with. Be tactful with ushers or congregation members who outright tell you they don't like how it sounds (I still suck at that). There are a ton of guys out there who can put together an excellent mix, and we should all learn from them... however, nobody wants to learn from a jerk, and they are doing a disservice to this "industry" by not being friendly enough to impart their wisdom in a humble, helpful way. If you're doing what you do with the right motives, people will notice, and they will naturally gravitate to asking you questions and getting your advice. If you're a jerk, it won't matter how skilled you are.
In short, don't be "that guy