Kid, I waited from when I was around 8 to now, and I turned 23 this year. My parents refused to let me get airsoft guns so many times that I've lost count. And you know what? They were right. Now I'm responsible for myself and I can actually afford to buy the guns with my own money. I thought I was pretty responsible when I was in my teens, but looking back now, I realize I often only thought I was. So, to repeat what people here already said one more time, forget about airsoft for the time being. Take up paintball or making money, both will help you when you're actually ready for the sport.
"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."