I grew up in tighty whiteys and switched to boxers in my early 20s. My teenage erections went whichever side my cock decided to fall when I got dressed in the morning, and I would have a hard left or hard right, or a hard up at some point each day. Hopefully it was in the middle of a class.
It seems like a lot of dudes go for "concorde" style - pointed straight down, and if in tight pants or too tighty whiteys, nowhere to go but further down and bursting out when hard and cramped but bending up. If this was your cock at some point in your development, and you kept it there, I would expect a "gonzo", and a downcurve when hard.
I haven't discussed this with most guys who have a gonzo, largely because I was wowed by their size, and more interested in stuffing my mouth. But I think this is an interesting discussion - and obviously most of our penises only develop fully after the age of 18, but when you were over the age of 18 and your penis was still developing, where did it point and do you think the many years you pointed it there made a shape difference.
Remember your adolescence is not the point of this discussion, so please restrict any experiences to penis growth after the age of 18, and take the rest to a teen boy discussion group.
You penis down/side-curve is the point of this.
Matthew