When I was very young I did go into assembly. I only remember two hymms that were sung, one of which was "All Things Bright and Beautiful." At 7 I had to stay and explain to everyone why I didn't go into assembly. I blamed my parents, afterall it wasn't my choice. Elementary school wasn't bad and I wasn't alone. There were lots of Muslin kids who didn't join in the religuious service held in school.
The first year of high school I stayed out and that was far worse. There were 3 of 4 kids of JW parents and we were the only ones who sat out assembly. Not only did we have to suffer jibes because of our religion we missed a lot of important annoucements. After that first year I didn't bother to sit out. No-one except the headmaster sang during assembly so I was harldy joining in a worship with the rest of the school.
Missing assembly, not singing the National Anthem, and not saying the Pledge of Allegiance are all things the Watchtower has decreed to make members different and to induce persecution. Sometimes these induced a huge amount of stress. School is hard enough as it is without deliberately going out of the way to be different. It's a wonder we survived and are not even more unbalanced.
3rd