I turn 19 in less than a month. A lot of people think it's unrealistic for me to start dumping all this money into my armor, with all these expenses I'm about to incur. College tuition, a car, gas, insurance for the car, phone bills, food, etc. With you being 17, it's going to be hard setting time and money aside to take this hobby on if you plan to do so. I assume you're still in high school.
I'm on the waiting list for an ATA armor kit, and despite the cost, I believe it will be worth it when I put it on and step out in public with it for the first time. Patience is key, which most of us young kids seem to lack.
In short, while many things may be more important than hobbies such as this one, being patient and setting a little bit aside every week will get you to where you want to be. Good luck.