TW: mentions of abuse

I recently cut off contact to my dad because he was physically abusive towars me when I was a child. It happened several times and because of that I didn't have contact to him from ages 12 to 16. I started struggling heavily with my mental health when i was 13, spent months inpatient and years living in therapy institutions. About half a year ago I saw a psychologist for an autism screening and ended up with a recommendation for trauma therapy. Even though Ive been in treatment for years, I was never considered a 'trauma patient' but looking back, there were some serious signs that apparently my previous providers ignored or didn't notice. I found a wonderful treatment facility and am now in the process of working through that trauma. I know that there were other factors contributing to my trauma so it's not like that is my only source of trauma but I've realised that most of it comes from the abuse. I havent talked about it a lot in recent years but i just feel like I'm blowing it out of proportion. Yes, he did beat me but i never had any bruises or injuries so it couldn't have been that hard. A part of me is saying that I'm justified and that it's never ok to beat your child, but the majority of me just can't believe that what happened could have caused trauma to that extent. Am i overreacting?