Actually, I felt the same as you. In my coming out letter, I told everyone they could call me Jessica, Jessie, or Jess, and that I knew it would take come time to adjust. I didn't want people to be scared that I would pounce on them if they accidentally used my old name -- habits are hard to break. Some people caught on quickly, others took a little more time. Within a month or so, all of the people I dealt with frequently had transitioned to my new name. The people who took the longest were those I had less contact with, like my parents, siblings, and their families. Some of those took a year or two for reprogramming. I did begin correcting them more forcefully after a year or so - my charity and sanity has limits.
Love always -- Jess