When I was younger, I was really shy and barely spoke in class. Even when I was desperate to pee, I wouldn't let on that I had to go, and would barely fidget so my friends and the teachers wouldn't catch on.
In grade 7, we had 8 classes every day, and only had a break for lunch time. The grade 7's who were good students got to be hallway and classroom monitors during lunch for the younger classes. I was a monitor, so most days at lunch, I only had 5 minutes to use the bathroom before classes resumed. Even though the teachers were mostly nice, none of them would let students go to the bathroom during the class right after lunch.
One day, I missed my 5-minute break because a teacher wanted to talk to me. I had had to pee all morning, and was just waiting for a chance to go. Talking to the teacher ended up taking up the rest of my lunch break, and when the bell rang, I wanted to cry. I knew asking to go to the bathroom during the next class would be pointless, so I sat through a double-class of social studies with my legs tightly crossed. I wanted to grab my crotch or shift in my seat, but was too afraid that it would make me look like a baby.
With only ten minutes left in the class, my bladder was spasming and cramping, but I was too afraid to ask to leave in case i was denied permission. I was too scared and embarassed to admit to the teacher and the rest of the class that I had to go so badly.
Our 3rd class of the afternoon was music, and it was right next to the bathroom. When we were finally let out to go to music, I was looking forward to getting the relief that I needed so badly. However, when we got within sight of the music classroom (and bathroom), I groaned. The music teacher was standing at the door and ushering people into the classroom! "Everyone go in and get their instruments, we have quite a few pieces to go over for the concert next month, and I'm assigning parts today too!"
I was fighting back not only my desperate urge to pee, but tears at this point since I had no chance to go to the bathroom and the cramps in my bladder were burning at this point. I tried to get the teacher's attention before class started, but he launched into the announcements of who was playing in the concert. The class was buzzing with excitement, and my friends were congratulating me on getting a good part, but I barely even heard them, I was focusing so hard on holding in what felt like liters of fluid. I stopped caring about who was watching and crossed my legs hard. I shifted and bounced in my seat, even while we played the music pieces. Finally, I couldn't even play my instrument anymore, I set it down and grabbed my crotch with both hands, and sat on my heel. Nothing was helping though.
As soon as the class stopped playing, I put up my hand to ask to use the bathroom. To my horror, the music teacher said no! I had been so focused on holding, there were only 3 minutes left in the class. They were the longest 3 minutes of my life. I didn't care that the teacher glared at me as I packed up my flute, threw my papers into my backpack and watched the clock. I was too scared to run out of class early, but when the bell rang, I made a mad dash for the door. My best friend was close behind me, and stopped me before I could get to the bathroom door. "What the hell was that?! I've never seen you do that before!" "I gotta pee!" I was crying now..."I know, but you'll get a detention if you're late to drama". She was right. I would get grounded too if I got detention, so I rushed down the hall to drama. Luckily, only a few of my classmates were there, and the teacher was sitting at her desk.
The drama teacher had a reputation for not allowing students to go to the bathroom during her class, but I was prepared to beg her at this point. My bladder was screaming for relief, and I couldn't even stand still while I stood next to the teacher's desk. Before I could even get the words out, she looked at me and then asked "Are you okay?" I shook my head no and asked if I could go to the bathroom. Thankfully, she said yes and I made my way out of the class to the bathroom. I got to the bathroom just in time, a small spurt escaped as I rushed into the stall finally. It had been seven hours since I had last gone to the bathroom. I had to ask to use the bathroom twice more during the drama class and barely made it to the bathroom both times. The teacher probably realized my situation, because she let me go both times.
After that experience, I always made sure to go to the bathroom during my lunch break.