Multiplicity

Who are the others? Do you know them? Our early experience was of feeling that there were other people within and around us, having their own individual preferences and reactions to things. Sometimes they'd 'become us,' which was excusable when we were little as playing pretend and imaginary friends (although every time we tried to make up an imaginary friend, they never quite felt real in the same way the others did), but we had to try to repress it as we got older. I'm not sure how similar this is to your situation; you're the only one(s) who can ultimately determine what you are, but, as others have said, multiplicity is one thing which can account for this. I encourage you to look around the Internet and read up on multiplicity, and see if it sounds like you. The userinfo for this community lists some helpful links.