You were boys on the verge of manhood, so she wasn't sure what names you should give yourself. The problem is that she didn't explain that quandary to you, probably because it was too difficult to explain. Trying to get an explanation of this sort of thing from a Japanese person is like pulling teeth;) But here is my simple summary, mostly male-oriented:Trabius wrote: I really don't know about the proper use of all the pronouns. I just remembered that in my college classes, my professor didn't like watakushi because she said it was too effeminate. Also, we were taught to use watashi as the general use of I, but I guess it could be effeminate for younger boys.
Young men should use "boku". They can also use "ore".
Young women should use "watashi" or "atashi" Some of them use "boku" and they get bullied for their trouble.
Older men should use "watashi". In really formal situations they might use "watakushi." They can also use "ore" if they feel like bragging, or "boku" if they are feeling humble. My correspondent in Osaka yells at me because I tend to use "ore" and "boku"... what can I say... I'm a musician, so I am eternally young .
Girls tend to refer to themselves in the third person until about middle school. Japanese boys also do this, but they are expected to stop doing it by the time they enter kindergarten, if not earlier.