I think as people we need to source pain and issues. If my finger is bleeding I can normally see a wound, if I'm hurting, scatter brained, emotional or mad I can't always see the wound so easy. I think nurture versus nature is always a tough call for people that have childhood issues.
Like I'm an ENTP on the MBTI test, what you mentioned is just who I am, starting and never finishing, it has nothing to do with my up bringing. I would suggest many of you try taking the "MBTI test" you can google that quote and take the 4th link down I think it is at simply minds, it will give you some clue as to who you are and maybe help sort out some of the issues that are part of your past from just who you are as a person.