Here are some names for feelings that you may not be aware of, or you may be aware of them but not know the name:
The realization that every person that passes you by has a life as complex as your own.
The wistfulness of used book stores. I've totally been there.
The awareness of your own heartbeat.
A conversation in which people talk, but no one is listening.
The effort to care less about things.
The awareness of how small your perspective is.
The frustration of being stuck in one body that can only be in one place at one time.
A state of exhaustion inspired by senseless acts of violence.
A hypothetical conversation you play out in your head.
A sadness that you will never see how history plays out.