I would wait brother. Training/bodybuilding/lifting is a long game. At 18, your body still has so much growing to do on its own. That is way too much gear to throw at your body at this age. If I were you, I’d stay in the gym, but AVOID ANY AND ALL PEDs while you learn what types of training and nutrition work for your body. You should be able to make tremendous gains at 18 with your natural hormone production. Being young is some of the best time of your life. Enjoy it, don’t complicate it with AAS so early. Go be a young adult. Training is great, but trying to be a pro bodybuilder at 18 will take away more from your young years of life than it will bring you positively. Bad trade at 18 in my opinion.
You don’t want to hit the gas too early , burn out, ruin and hurt your body before you know what you’re doing, and wind up depressed with a ton of side effects rather than results. Save your body. You only get one. You have plenty of time.