This is a little difficult to explain...
Until I was about 12 years old I never realised that I was an individual person, and that everyone around me were individual people. I think that because of my poor ability to filter what is around me, I felt like I was EVERYONE and every thing around me. I felt their emotions, always aware of where everyone was and what they were doing, like my mind was as big as the classroom I was in.
It wasn't until I began high school that I realised that I could make my own choices, that I had likes and dislikes, my own emotions separate from those around me, and that I fit inside just my body.
Even now when I go to social things I am super aware of everyone else's emotions, what they're doing. I feel responsible for their wellbeing, but mostly I feel overwhelmed by how much my brain is trying to process.