My post may sound critical but I do commend you for realizing that change is necessary but as MIR has said - as long as the door stays open you WILL walk through it.
You will hear that here as anyone who has quit - finally quit - has experienced the feeling you get when you realize that you can't go back. It is a feeling of being disconnected and unsupported and a feeling that we all fear greatly but one that subsides as you find a new way to live.
Should you choose to leave it behind you will get a lot of support here. Just stay in touch. Hell. Stay in touch no matter what you choose to do.