Smallest penis in the friend group

I went to a forest on a school field trip for a nature class we had at my school. It was fairly normal, it was a mixed gender Christian school but it was an all boys field trip (they were worried that the couples would sneak off and bang in the woods if they went together) so it wound up just being a group of guys joking around in the woods. We had a campsite with a bunch of tents/sleeping bags set up and around 9:30 my teacher (an older man) made us go to bed. Of course we were teenagers so around 10 we made sure he was asleep and snuck out. None of us had a plan and we obviously didn't have any drinks so we decided to skinny dip. All of us undressed and got in the cold lake water before getting out like 10 minutes later because of how cold it was. Not to hype up the friends I had at the time but they all had notably large penises. The smallest besides myself was like 4 inches (I'm guessing since I didn't exactly ask) and the largest had double what the small guy had so like 9+ inches. As we were just in the cold water theirs had probably shrunk a bit meaning they were even bigger than what they had when they got out. Me on the other hand I had shrunk down to literally 0 inches (like it was barely peaking out) everybody tried to avoid staring since this was a Christian school and they didn't want to be seen as gay. As tempted as I was to say something about it I didn't want them to know how tiny my penis was since I assumed that it would spread like wildfire around the school.