I left almost nine years ago at age 18; my only real regret was that I was good friends with a young brother and I never said goodbye to him, or even let him know that I was planning to leave (had to leave my parents' home secretly while they were at the meeting one Sunday; they had such a hold over me that I could never have stood up to them and told them beforehand).
I have no other regrets about leaving; I'm am now happily agnostic and SO THANKFUL that I found the strength to break free.
Anyone have any similar regrets?