This is hard to explain, but a lot of the time I will act as if people are there with me. I'm not saying I see people or hear voices, and I don't do it in front of other people and I know they aren't really there. They tend to be people such as favourite actors etc, and I'll talk to them (not out loud) about stuff. It's nice to do so, and has probably helped my fanfiction a bit.
When I was a teenager, I would worry that I wasn't perceived by others as myself, and I would get these thoughts that they would think I was a character from a television programme or someone who had been in the news, even though I knew this was stupid and that they saw me as myself (they being friends, other people not in my family etc).
Anyone else do this?