The fact that you need to ask for advise on what to do to get a life for yourself speaks volumes.
(I was similar - I am not being nasty)
The fact that your are so lost, should immediately tell you where you went wrong in your relationship i.e. A women wants a man who knows what he wants. You clearly don't because you sacrificed that for your family. Even though I understand why you did it, you still fell into the trap that thousands of divorced men fell into.
Even though I am sure you are a great guy, are you still the strong minded individual you potential where before you met?
Im sure deep down you know that you changed.
You need to get that back.
Read that co dependant no more book and gym are a good start.