Steroids or genetics? I started losing my hair in my late teens. It could have been the result of either of those or both.
Genetics. Never done roids. I had a friend and lifting buddy that started doing roids at 13, I told him I heard he should wait until he is 18. Well, he stunt his growth, dude is as short as coach now. That and his bitch tits and other sides, turn me off of roids forever. I also joined the power lifting team in high school for a couple years. So there was pressure to start, but I never did. I have nothing against steroids. I just don't think it is worth it if you're not a college sport star or in the NFL or something.
But yeah, starting going bald. Tried rogaine, didn't really work to well, then just manned up, and shaved that shit off.