I was in grade 6 (?) and was around 12 years old. The group i was in was split up in smaller groups of four or five people. My group consisted of three girls and two boys (including me). One day one of the girls thought it would be fun to call eachother by names of the other gender. They chose Nina for me. Although i didn’t like Nina as a name at all, i did like being called by a girl name. It was kind of weird that i didn’t see this as being unusual at all.