You're not entirely unreasonable.
I was "groomed", before the days that people really started talking about grooming. Thankfully in my case, nothing too serious happened.
I had a similarly difficult relationship with my parents and never felt able to tell them, or ask for help while it was going on. I worried I would get into trouble.
In my case it was also someone in a position of trust, who knew about my home life, and knew that I was desperate to feel "loved". They took advantage of that in a way that they may not have been able to do, if I had felt secure at home.
That being said, I made the choice not to tell my parents at the time. Looking back, had I told them, they would absolutely have sorted it, because actually, they love me to death.
So, I think I was more vulnerable / at risk because of the home situation, but it's not actually their fault per se, it's the fault of the abuser that it happened.