If you're really good at Call Of Duty, which I'm sure you are (way to go with that, by the way) and you're not quite 18 but basically 18 enough for it to not be too much of a big deal, you can now be a part of a major Call of Duty Tournament. If you're over that age you can be part of it too, but what's special about you? We live in a society that only sees value in youth and if you aren't young you're essentially useless. Get out of here, why don't you go ride a bus for free because you are old.
It's not just any Call of Duty Tournament, by the way, it's an Xbox presented Call of Duty Tournament where there's a million dollar prize pool up for grabs. You probably want some of that. That's a lot of money.
You should probably get moving and put a team together too since the event's in April and they're only allowing 32 killer COD-Squads from all over the world to compete. This website explains the particulars of how you get involved. It's pretty complicated. You need to be as good at understanding it as you are definately very good at playing one specific video game to a professional level.
If you win, which I'm sure you will, please make sure to shout the words "What even is a Call Of Duty anyway? I kinda just winged this."
People will think it's really funny. I will, at least. It's what I'd do if I were there.