Well...since your asking, I am assuming you want some opinions - so here's mine:
Don't f%$#ing do it yet. It seems like you've made an incredible achievement already - 6ft2", 205lbs, 8% body fat, and them lifts read pretty good. I don;t believe even for ONE SECOND that you're anywhere near your natural limit at 19...come on man, be serious.
My advice would be to wait at least another 5 years man. I didn't even CONSIDER my first cycle until my late 30's. This way I knew for certain that through hard training and dedication I was at my natural limit. I would push your natural limits more man.
What sups are you taking, hows your food intake, your sleep, etc... Have you mastered all the things that will help you reach your full training potential? You're young enough to get away with more natural training, trust me man, I'm old...that much I can offer you from an expert point of view lol.