Knowing teenagers as I do, their energy and devotion to getting what they want could be a significant factor in enacting sane gun control in this country. May I suggest that every teenager in the country Google "Find NRA Near You" in their state and make plans to disrupt as many of their activities as possible.
"Friends of NRA" lists events happening in your area. Organize a counter-event. Do what you can, where you can, when you can. Be familiar with NRA.org website and fight for your lives!