Gym shower

I was just showering at the gym minding my own business when an other guy my age (I’m 27) came in. For context the showers are just in an open room with no cubicles. I just glanced over and immediately noticed that he had a huge dick. Although I immediately stopped looking and just continued showering, I started getting a semi. So I just tried to face the other wall and hide it as much as I could and even turned the water to cold. I finished showering started drying myself off always facing away from the guy, but I couldn’t stop thinking about what I had seen, by now I was almost fully erect. Suddenly an other guy enters the showers and I’m pretty sure he noticed my boner also the guy with the big dick steps next to me because his shampoo was at the towel rack. Both guys pretty surely noticed my boner.

Should I be ashamed, is that normal or do you even maybe think the guy took it as a compliment?