Can ANYONE increase their vertical enough to dunk?

I'm a fresh 15 year old. (Just turned 15 2 days ago) and I'm 6'2'' and my standing reach is 7'10'' (If that matters). I could barely touch the backboard less than 5 months ago, but through plyometrics and leg exercises I've increased enough to touch the rim. That's about a 4-6 inch increase. Since my realization that I could touch the rim, it's been about a month of no gain. This kinda makes me discouraged but I haven't been slacking on my training. I've been somewhat inspired by Shannon Brown of the L.A. Lakers and Derrick Rose of the Chicago Bulls...both of whom are a mere 6'4'' (I think Derrick Rose is 6'3'' but whatever) and they can both get their heads pretty much at the rim...I'm not saying I think I'd ever do that but I'd really like to be able to dunk..I can dunk on a rim that' set at 9 feet and 8 inches. So I need about a 6-8 inch increase to dunk comfortably...do you think this is possible considering I have a vertical of about 26 inches already? (10 feet minus 7'10'' standing reach means my jump is 2 feet and 2 inches)...I am white. But I don't think that matters, even though it's quite evident that black people have incredible natural hops. I also probably am not done growing considering I only just turned 15...so do you think dunking could be in my near future?? (Near future meaning like 8-10 months???)