I know exactly how you feel. Not the circumstances around why but definitely how you feel. I do not have an answer for you unfortunately but know that you are not alone. If you feel like talking it out let me know. Maybe we can find the answers to our questions. That and its nice to have someone listen to you for once.
Well begin by sending me a message. I may not have all the answers and I may not have my stuff all together but I listen well.
This is inherent. The will to live.
If you feel no pain, there is no incentive to leave either?
Do you want to do that? Just pretend, or tell them the truth. If they seem like they are emotionally close to you, you should just tell them the truth, but that it's okay that they feel close and that they should be in your life anyway. If they're more distant it's okay to pretend, just be honest to yourself that you're pretending and don't let that consume your personality.
Are you sociopathic? It sounds like you may be and you just don't realize it because you aren't violent/aggressive.