It sounds to me on some level you are linking your mistake with the punishment and loss of your family, but they were never there for you anyway. They were looking for a reason to distance themselves and this just happened to be it. This is about the loss of your family, not the drink driving offence.
Although dd is not ideal, in emergency situations people can not always rationalise how to save themselves, they are in flight and fight mode and you took the only option available to you at the time - as most people would, you were trying to survive and rightly so.
Given your terrible childhood it was hardly surprising that you ended up in this position op,,it was familiar to you to be abused.
What you needed at the time was love, support and empathy. To be held and cared for. Instead your family rejected you in the most callous way and would have found another reason if it was not this one op. In your sub conscious you carry this deep shame, but it’s not your shame to carry. Does the man that abused you and forced you into such a dangerous position feel shame? Do your family feel shame for abusing you? Do the police feel shame for not arresting the perpetrator of domestic violence?
You are the victim here op, and I am so sad you are so triggered this evening.
You need to go back into counselling and learn how to love your own self, and to recognise just how badly you have been let down by your parents in particular.
I will ask you one thing op, why didn’t you call your parents when you were afraid? Why did you flee to a friend’s house? You knew they wouldn’t be there for you that’s why - because they never were, and that’s why you were in this position in the first place. Most people would have had their family to call in a fire situation. With most parents rushing over to offerr support sand protection. You would not have needed to drive had you been properly cared for in the first place.
I hope you can make peace with your one mistake - and will find the confidence to be honest with your dd about the circumstances that led to this conviction (but please only tell her if you are sure she will be kind)
You are very fragile and must take care of yourself at the moment. Speak to the Japanese embassy most make exceptions for driving offences. Go into coubseinh and deal with the past once and for all as it is really impacting your life op. You deserve to be free of shame and sadness, and to live yore life fully 💐