Dude, chill. Just relax, play and enjoy the game.
If you really want to help people, you can do so without staff powers. Ask in chat if anyone needs help building, try and give out free items, and Do NOT aim for mod. Do it out of the good of your heart.
If the mods see you are doing a good job after a long period of time, and believe me they do look and watch, you might get helper. even if you aren't of age.
Just look at Xcoaster and Gotmilk! They're 14 and mods. They aren't age-ist, us kids are mainly immature. that's why it sais 'Preferred 16+'
So just take a chill pill, and take your time playing minecraft.
If you want staff powers so badly that it interferes with your ability to play with others, start your own server or take a break.