Hi OP. I grew up in the 60s and 70s and our father used to smack us so there was a red mark on our legs or arms for days. He was a bully. My resentment increased when I was a teenager and he told me that I was “too old“ now to be “smacked“. So you hit a little child, and that’s ok.
He one walloped me for something my sibling had done. He didn’t just do it once; it was a repeated thrashing. He used his hand and completely lost control. After, when he found out that my sibling had in fact done what he was punishing me for, and which in any case was a minor, minor genuine accident, he came to me and demanded that I forgive him. He used to jeer at me when I flinched away from him.
As I grew up, I came to despise and detest the man, whilst eventually understanding something of the mentality and personality that led him to do it. My mother never, never once objected to what he did, although I am fairly certain that it never went on in her house when she was growing up. This did not go on in the homes of my school friends. I remember being amazed when I was in the home of one school friend when her father returned home from work and she was actually pleased to see him. I can remember my astonishment to this day.
There’d be no point in having raised it with either parent for reasons to do with my parents’ relationship with each other and their lack of consideration towards me: it would’ve achieved nothing.
So my advice is not to raise it with your parents, but get yourself therapy and come to terms with how it has affected you. It’s immaterial whether at the time it was normal or not: what matters is how it affected you and how it affects you now.