I think you've hit the nail on the head lastminuterush, that the problem is that other people's interpretations range so widely, from 'very normal childhood for that time' to definitely abusive.
FWIW what you say resonates hugely with me- you've kind of put into words what I've always felt. I'm older than you so mine was a 60s/70s childhood. I have no doubt my parents loved me, and I honestly think they would have believed they were doing their best but I find it very hard to come to terms with some things. As a child I was caned for 'big' misdemeanours. I clearly remember an occasion when my brother accidentally broke an expensive ornament. We both got caned because I happened to be in the room with him and my dad clearly felt we were both responsible.
The photos thing- YY, as I got older I loathed the family photo thing, I was very self conscious as a teenager and this made it far worse.
Church- we all had to go as a family once or twice a week; my mum was a believer but I think my dad just went along with it. This continued until I was about 15 and given a choice
Other than the specifics, like you I had a general feeling of being socially isolated. My parents never had friends around for a meal or even a cup of tea. We'd see relatives a few times a year but it felt as though my parents saw the family as a very tight unit and didn't feel any need to be outward looking. I could have a friend over for tea now and again but no sleepovers (again, maybe this was usual for the 70s?)
Although I believe my parents genuinely loved me and wanted us children, I never felt any close bond in terms of confiding in them; in fact I can't think of a single case where I've talked to them about anything of real importance or things which worried me. Even from quite a young age I had a kind of feeling of needing to 'protect' their feelings... I sensed they wouldn't cope well if I told them stuff which they would see as problematic; e.g. For a period of time I was bullied and quite unhappy at school but there was no way I felt I could tell my parents.
I feel curious and a little envious when I hear adults talk about having a really close relationship to their parents because I can't relate. Having said that, in some ways perhaps it's helped me to be very self sufficient and I can honestly say I have a happy life and I've worked hard at raising my children to feel they can be their true selves.
Sorry Lastminuterush, this post has all been about me. But your post just hit the nail on the head about how I feel and that confusion over whether a lot of it is 'normal' or whether I have the right to feel angry/let down. I've sometimes wondered about counselling but TBH I think my coping mechanism has been to tell myself my parents did their best even though it was far from perfect. I also think it's so hard to judge anyway, because societal norms change and things which seem unspeakable now were perhaps far more common 40 years ago.