I will avoid the bashing bits.
You want to enjoy the best possible body for your age, as you stated your prime? How does not being able to perform when you get a hot girl because your post cycle therapy (pct) sucked...now everyone will know you as limp dick Mcgee. Gyno, test levels not returning to normal, your nuts ARE going to atrophy on cycle. Know girls who like raisins? Is that the idea of your perfect body?
I am 24, spent the entire last year sick, losing all my gains and starting over. You dont need steroids at 18 because I know I dont need steroids at 24. Use of supplements can aid you in your goals, but diet and training will grant you all the gains you could desire up until you reach that point of going above what your frame can hold IMO. Also there are theories on burning out your androgen receptors and so forth.
Save steroids for a few years down the road. I started looking at cycles at 19 years old...Studied alot...I am 24 never having cycle but having collected such books as Anabolic Pharmacology by Seth Roberts, reading hundreds of logs, studying research papers...They are an amazing tool yes. But one to be used responsibly.
Just because you want to take a shortcut(as we are taught to do in America, never accept responsibilities, and always take shortcuts to get what we want) does not make it the right choice. Ultimately its your choice, just like ultimately it is your body.
You know how often young men in their late 20's are ending up on testosterone replacement therapy (TRT) now...
Enjoy not having to pin youself for your goals man..Enjoy not having side effects, not having insomnia and night sweats, enjoy not risking infection to stick yourself, enjoy not worrying about an abcess. Enjoy being young and having a body producing more testosterone than you could want, but not understanding that concept. Enjoy not having your BP shoot up, enjoy not having acne go crazy, enjoy your hair, enjoy your body functioning at its PRIME.
Some people pin literally to just maintain a healthy life. Enjoy what you got, save pinning for when it will have a greater benefit down the road.