For a long time I went by my full name at work but family and friends were always by nickname. Now I work with someone who was a friend and was used to calling me my nickname and would introduce me to others by it, so it started to bleed.

However at work, I still refer to myself by my full name with people I don't like or trust as much. If anyone ever figures out my system they'll realize how I feel about people in the office very quickly hahaha.