It is fine if people don't consider themselves underrepresented, we just want to be proactive about discovering if people end up self selecting themselves out of our community because they don't feel welcome. Furthermore, we are starting some initiatives to focus growing a diverse group of participants (https://github.com/rust-community/RustBridge), and so we need some baselines to see if we are successful or not.
We did have a number of categories that people could select from. Our plan for next year is to identify groups from the free text for next year. We are tracking our improvement plans here: https://github.com/rust-community/team/issues/28