yesterday at McDonalds I noticed a guy in line and I noticed the outline of his penis, he just had shorts on and nothing under them. I constantly looked but did my best in acting like I wasn't looking

Took a couple photos of him and IT. And last night I looked at the photos and masturbated to them.
I know what I was doing was wrong but I also enjoyed it. Is this something over the top for me or something normal? No way am I asking or telling my gf's about this, lol!
And, my last embarrassing question, if the outline of his penis is maybe 5 inches what would it be when erect?
I am going to go hide in the corner now
