I was at my worst when I was around 13-15. Back in grade 9, I was sitting down and some other kid in my class accidentally hit me in the head with his bag. I was so shy that I didn't even say anything to him. If it wasn't for some girl in my class that told him what he did, he wouldn't even have noticed. Also, if I knew that I had to partner up up with someone I would usually skip class that day.
This sounds exactly like me. My shyness really depends on the day too, but some days I am incredibly bashful.
Highschool boys made me extremely nervous because they were jumping all over the place, play fighting in the halls, pushing/shoving so much that they actually ran into me at times and they would just keep on going like I wasn't there. I sometimes mustered up the strength to say excuse you, but it was embarrassing when they didn't hear me and would keep on pushing. I wanted to punch someone, but when I speak up everyone thinks I'm crazy. I really don't like people. I have a bad attitude? No you have a nasty attitude because I'm getting on you for not respecting me. Oh say something to a popular kid and the group mentality was on.
I hated highschool, it was a piece of **** and the people were big......
I would skip days for partners too, I hated it. I remember one year gym class I had a partner because she was shy too, but it was so hard to find one. I got partnered up with the shy people. Which was cool because we got our work done faster. I would panic when they were sick.