I did something similar as a kid though I didn't veiw it as a white knight kinda thing. I would get "father crushes" on men in my life. Id want them to be my dad and I'd imagine them takeing me and my mom away from the abuse going on in my house.I did that till one of the guys I imagined saveing me saw some of the abuse and he kept his mouth shut. I did end up haveing a wonderful father fugure. Met him when my parents were devorceing. He was allways there for me untill he died. Family isn't blood. He's my real family.
On a side note I allways wanted to be the knight or the warrior as a kid.