You are obviously overwhelmed. I'm sorry that you've encountered such events. I hope you feel very safe when out with your dad, as the more you can do that the easier it will be. You need some good stuff in your life. Dissociating isn't something you can do much about right now, as it's your way to cope with what you are feeling.

Keep telling yourself, while at home, that you are safe now. And when you are out with your dad, do the same, say to yourself, I am safe. It will take many good things to overcome the bad, but you can do it: your mind can do it.

I hope you feel and do better sooner rather than later.