As my personality dictates, I feel extremely depressed, lazy, apathetic and lonely when no one is around, but get extremely giddy and excitable when i'm talking to or am around people. So I guess my power would be an amplification of my human attributes; smarter, faster, stronger, when i'm around other people, but become extremely weak and stupid when separated.
Perhaps when I would first get my abilities, I would be filled with a sense of hubris and arrogance that could lead me to dangerous situations.