When is it enough?

So when you start to question who you are..  How is it that all of a sudden the thoughts you never thought you could be capable of having are now a constant thought?  How is it that when you feel your baby kick for the first time, or hold her for the first time, you think that you could never feel different, you feel that you would protect her with your life no matter what, you feel like there is nothing your baby could do to ever change the way you feel in that moment...  13 years later after all the sacrifices after giving up everything, after providing every possible thing imaginable, after going from a 1 bedroom apartment to a four bedroom house, a safe neighborhood, and all the other materialistic objects, the clothes, the nail, the electronics...  How can that same child hold such hate, such anger, such resentment, pure and utter disrespect and complete defiance toward you?  How is it that every single thing you say is flipped around against you in such a hateful way?  You never give up, you never stop trying, you seek the help of family, they turn away because they can't get out of they're own way, you get professional help, medications, Baker Acts, child protective investigators, cop's, teachers, guidance counselors, psychiatrist's, psychologists, and yet your child still looks at you like look at what you've done to me, this is all your fault.. Its at that moment that I'm asking myself, what now? Every conversation turns into a confrontation. This is so much more then the normal teenage issues, this is a pure hatred that this child has for her life, and those in it. Anyone in an authoritative position is the enemy.  And here is where I question who I am... I never in a million years ever even though for 1 second that I would contemplate the prospect of letting go.. letting go of the caring, letting go of all the extras, letting go of the emotions, letting go of all the sacrifices and just simply providing the bare necessities.  How do you decide that? Who helps you decide when its just your decision to make?  How do you let go when sometimes, you just need to let go?